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Slowly varying; a constant is far below\n// the precision that a day boundary needs.\nconst DELTA_T_SECONDS = 69;\n\nconst RAD = Math.PI / 180;\nconst sin = (deg: number) => Math.sin(deg * RAD);\n\n/**\n * Julian Day (UT) of the new moon numbered `k`, where k=0 is the new moon of\n * 2000 January 6. Meeus, *Astronomical Algorithms* ch. 49, without the small\n * planetary terms; the residual error is well under a minute.\n */\nexport function newMoonJd(k: number): number {\n const t = k / 1236.85;\n const t2 = t * t, t3 = t2 * t, t4 = t3 * t;\n\n let jde = 2451550.09766 + 29.530588861 * k\n + 0.00015437 * t2 - 0.000000150 * t3 + 0.00000000073 * t4;\n\n const e = 1 - 0.002516 * t - 0.0000074 * t2;\n const m = 2.5534 + 29.10535670 * k - 0.0000014 * t2 - 0.00000011 * t3;\n const mp = 201.5643 + 385.81693528 * k + 0.0107582 * t2\n + 0.00001238 * t3 - 0.000000058 * t4;\n const f = 160.7108 + 390.67050284 * k - 0.0016118 * t2\n - 0.00000227 * t3 + 0.000000011 * t4;\n const omega = 124.7746 - 1.56375588 * k + 0.0020672 * t2 + 0.00000215 * t3;\n\n jde += -0.40720 * sin(mp)\n + 0.17241 * e * sin(m)\n + 0.01608 * sin(2 * mp)\n + 0.01039 * sin(2 * f)\n + 0.00739 * e * sin(mp - m)\n - 0.00514 * e * sin(mp + m)\n + 0.00208 * e * e * sin(2 * m)\n - 0.00111 * sin(mp - 2 * f)\n - 0.00057 * sin(mp + 2 * f)\n + 0.00056 * e * sin(2 * mp + m)\n - 0.00042 * sin(3 * mp)\n + 0.00042 * e * sin(m + 2 * f)\n + 0.00038 * e * sin(m - 2 * f)\n - 0.00024 * e * sin(2 * mp - m)\n - 0.00017 * sin(omega)\n - 0.00007 * sin(mp + 2 * m)\n + 0.00004 * sin(2 * mp - 2 * f)\n + 0.00004 * sin(3 * m)\n + 0.00003 * sin(mp + m - 2 * f)\n + 0.00003 * sin(2 * mp + 2 * f)\n - 0.00003 * sin(mp + m + 2 * f)\n + 0.00003 * sin(mp - m + 2 * f)\n - 0.00002 * sin(mp - m - 2 * f)\n - 0.00002 * sin(3 * mp + m)\n + 0.00002 * sin(4 * mp);\n\n return jde - DELTA_T_SECONDS / 86400;\n}\n\n/** Unix seconds of the new moon numbered `k`. */\nexport function newMoonUnix(k: number): number {\n return Math.round((newMoonJd(k) - UNIX_EPOCH_JD) * 86400);\n}\n\n/** The `YYYY-MM-DD` an instant falls on for an observer at `offsetSeconds`. */\nexport function civilDate(unixSeconds: number, offsetSeconds: number): string {\n return new Date((unixSeconds + offsetSeconds) * 1000).toISOString().slice(0, 10);\n}\n\n/** `YYYY-MM-DD` shifted by whole days. */\nexport function addDays(dateKey: string, days: number): string {\n return new Date(Date.parse(dateKey + \"T00:00:00Z\") + days * 86400_000)\n .toISOString().slice(0, 10);\n}\n\nexport interface LunarFifteenth {\n /** Civil date of the lunar month's 15th day, in the anchor zone. */\n dateKey: string;\n /** Civil date the lunar month begins on: the day holding its new moon. */\n newMoonDate: string;\n /** ISO instant of the new moon that starts the month. */\n newMoonUtc: string;\n}\n\n/**\n * Every lunar 15th whose anchor-zone date falls in `year`, in ascending order.\n * The k range overshoots the year on both sides so no boundary month is lost.\n */\nexport function lunarFifteenthsForYear(year: number): LunarFifteenth[] {\n const kFor = (y: number) => Math.round((y - 2000) * 12.3685);\n const out: LunarFifteenth[] = [];\n for (let k = kFor(year) - 14; k <= kFor(year) + 14; k++) {\n const unix = newMoonUnix(k);\n const newMoonDate = civilDate(unix, ANCHOR_OFFSET_SECONDS);\n const dateKey = addDays(newMoonDate, 14);\n if (dateKey.slice(0, 4) !== String(year)) continue;\n out.push({ dateKey, newMoonDate, newMoonUtc: new Date(unix * 1000).toISOString() });\n }\n return out.sort((a, b) => a.dateKey < b.dateKey ? 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Match Moon's fallback zone, resolved for the day in question.\n const name = new Intl.DateTimeFormat(\"en-US\", {\n timeZone: FALLBACK_ZONE,\n timeZoneName: \"longOffset\",\n }).formatToParts(new Date(dateKey + \"T12:00:00Z\"))\n .find((p) => p.type === \"timeZoneName\")?.value ?? \"GMT+00:00\";\n const [, sign, hh, mm] = /GMT([+-])(\\d{2}):(\\d{2})/.exec(name) ?? [, \"+\", \"00\", \"00\"];\n return (sign === \"-\" ? -1 : 1) * (Number(hh) * 3600 + Number(mm) * 60);\n}\n\n/** The reader's current civil date. */\nexport function fromDate(offset: number | null, now = new Date()): string {\n const today = now.toISOString().slice(0, 10);\n return new Date(now.getTime() + offsetSecondsFor(offset, today) * 1000)\n .toISOString().slice(0, 10);\n}\n\nfunction monthDay(dateKey: string): string {\n return `${MONTHS[Number(dateKey.slice(5, 7)) - 1]} ${Number(dateKey.slice(8, 10))}`;\n}\n\nexport async function lunarItems(dateKey: string, offset: number | null): Promise {\n const result = await sqlite.execute({\n sql: \"SELECT date_key, payload FROM lunar_fifteenths WHERE date_key >= ? ORDER BY date_key LIMIT 1\",\n args: [dateKey],\n });\n const row = result.rows[0];\n if (!row) return [];\n const key = String(row.date_key);\n const payload = JSON.parse(String(row.payload));\n return [{\n id: `lunar15-${key}`,\n mainText: \"Lunar 15th\",\n subText: `Cycle from ${monthDay(payload.newMoonDate)}`,\n // The lunar 15th is a whole day, not an instant. A caption keeps the widget\n // from rendering the anchor time as if it meant something.\n caption: \"DAY 15\",\n emphasized: false,\n // Local noon, so the reader's own day label is the lunar 15th itself.\n timestamp: Date.parse(key + \"T12:00:00Z\") / 1000 - offsetSecondsFor(offset, key),\n }];\n}\n\n/** Replace one calendar year of lunar 15ths authoritatively. */\nexport async function rebuildYear(year: number): Promise {\n await ensureSchema();\n const rows = lunarFifteenthsForYear(year);\n const fetchedAt = new Date().toISOString();\n await sqlite.execute({\n sql: \"DELETE FROM lunar_fifteenths WHERE date_key LIKE ?\",\n args: [`${year}-%`],\n });\n for (const row of rows) {\n await sqlite.execute({\n sql: `INSERT INTO lunar_fifteenths(date_key,payload,fetched_at) VALUES(?,?,?)\n ON CONFLICT(date_key) DO UPDATE SET payload=excluded.payload,fetched_at=excluded.fetched_at`,\n args: [row.dateKey, JSON.stringify({ newMoonDate: row.newMoonDate, newMoonUtc: row.newMoonUtc }), fetchedAt],\n });\n }\n return rows.length;\n}\n\nexport default defineSource({\n key: \"lunar\",\n settingsSchema: { type: \"object\", properties: {}, additionalProperties: false },\n parseSettings: (raw) => Object.keys(raw).length === 0 ? accept(null) : reject(\"invalid_settings\"),\n read: (_, { utcOffsetSeconds }) =>\n lunarItems(fromDate(utcOffsetSeconds), utcOffsetSeconds),\n writes: {\n // A whole year at a time: the lunar calendar is computed, not fetched, so\n // there is no per-date upstream to page through.\n \"calendar.rebuild\": async (raw) => {\n const year = raw.year;\n if (!record(raw) || typeof year !== \"number\" || !Number.isInteger(year)\n || year < 1900 || year > 2999) {\n return reject(\"invalid_rebuild_payload\");\n }\n return accept({ year, count: await rebuildYear(year) });\n },\n },\n});\n",[],[185],"8268a0ac-d202-411f-bef9-1a2cb46a8286","ingest.ts","c255ff36-ab9f-11f1-983f-1607ee4eb77e",7,["D",1788883886330],"interval","// Annual ingest: once a year, in the last month, build the whole next year.\n//\n// The lunar calendar is computed rather than fetched, so a year's worth of\n// rows is a few milliseconds of arithmetic and there is nothing to poll for.\n// Runs in this val, so it writes this val's SQLite directly rather than over\n// the source protocol. Schedule: `0 0 1 12 *` (1 December, UTC).\n//\n// The current year is rebuilt alongside the next one. It is normally already\n// stored and identical, but including it means one run of this file is also\n// the deployment seed, so there is no separate first-year bootstrap to forget.\nimport { rebuildYear } from \"./lunarSource.ts\";\n\nexport default async function (_interval: Interval) {\n const current = new Date().getUTCFullYear();\n for (const year of [current, current + 1]) {\n console.log(`lunar: rebuilt ${await rebuildYear(year)} fifteenths for ${year}`);\n }\n}\n",[],[193],"7684fb64-5367-4621-9925-e1c0bfbd24d2","check.ts","e66e4f22-ab9f-11f1-a7c9-1607ee4eb77e",6,["D",1788883867912],"// Lunar contract, calendar and storage checks. Disposable rows are removed.\nimport handler from \"./rpc.ts\";\nimport lunar from \"./lunarSource.ts\";\nimport { fromDate, lunarItems, offsetSecondsFor, rebuildYear, ensureSchema } from \"./lunarSource.ts\";\nimport { civilDate, lunarFifteenthsForYear, newMoonUnix, ANCHOR_OFFSET_SECONDS } from \"./lib/lunation.ts\";\nimport { serveSource } from \"https://esm.town/v/plusjade/source-sdk@3-main/mod.ts\";\nimport { sqlite } from \"https://esm.town/v/std/sqlite/main.ts\";\n\nfunction check(ok: unknown, message: string) { if (!ok) throw new Error(message); }\nconst base = { protocolVersion: 1, sourceKey: \"lunar\" };\n\n// The protocol is exercised through the definition; the mount below is checked\n// for authentication only, so these checks need no token to run.\nfunction call(path: string, body?: unknown) {\n return serveSource(lunar, new Request(\"https://lunar.invalid\" + path, {\n method: body === undefined ? \"GET\" : \"POST\",\n ...(body === undefined ? {} : { body: JSON.stringify(body) }),\n }));\n}\n\n// --- calendar arithmetic -----------------------------------------------------\n// Meeus numbers lunations from the new moon of 2000 January 6.\ncheck(new Date(newMoonUnix(0) * 1000).toISOString().slice(0, 10) === \"2000-01-06\", \"k=0 anchor\");\n\nconst y2026 = lunarFifteenthsForYear(2026);\ncheck(y2026.length === 12 || y2026.length === 13, \"12 or 13 lunar months in 2026\");\ncheck(new Set(y2026.map((r) => r.dateKey)).size === y2026.length, \"unique date keys\");\ncheck(y2026.every((r) => r.dateKey.startsWith(\"2026-\")), \"year bounded\");\ncheck(y2026.every((r, i) => i === 0 || r.dateKey > y2026[i - 1].dateKey), \"ascending\");\ncheck(y2026.every((r) =>\n (Date.parse(r.dateKey) - Date.parse(r.newMoonDate)) / 86400_000 === 14), \"day 15 is new moon day + 14\");\n\n// Synodic month is 29.27-29.84 days; anything outside means a dropped lunation.\nfor (let k = -100; k < 100; k++) {\n const gap = (newMoonUnix(k + 1) - newMoonUnix(k)) / 86400;\n check(gap > 29.2 && gap < 29.9, `synodic gap at k=${k}`);\n}\n\n// Two published dates that pin the UTC+8 anchor convention end to end:\n// lunar new year 2026 (month 1, day 1) and mid-autumn 2026 (month 8, day 15).\ncheck(y2026.some((r) => r.newMoonDate === \"2026-02-17\"), \"lunar new year 2026-02-17\");\ncheck(y2026.some((r) => r.dateKey === \"2026-09-25\"), \"mid-autumn 2026-09-25\");\ncheck(civilDate(0, ANCHOR_OFFSET_SECONDS) === \"1970-01-01\", \"anchor civil date\");\n\n// --- offsets and selection ---------------------------------------------------\ncheck(offsetSecondsFor(50400, \"2026-06-01\") === 50400, \"offset passthrough\");\ncheck(offsetSecondsFor(99999, \"2026-06-01\") === -25200, \"out-of-range falls back to Pacific DST\");\ncheck(offsetSecondsFor(null, \"2026-01-04\") === -28800, \"null falls back to Pacific standard\");\ncheck(fromDate(null, new Date(\"2026-01-04T07:30:00Z\")) === \"2026-01-03\", \"winter fallback\");\ncheck(fromDate(50400, new Date(\"2026-01-03T12:00:00Z\")) === \"2026-01-04\", \"positive boundary\");\n\n// --- protocol ----------------------------------------------------------------\nconst desc = await (await call(\"/v1/descriptor?sourceKey=lunar\")).json();\ncheck(desc.temporal && desc.sourceKey === \"lunar\", \"descriptor\");\ncheck(JSON.stringify(desc.capabilities.write) === '[\"calendar.rebuild\"]', \"writes\");\ncheck((await call(\"/v1/read\", { ...base, settings: { x: 1 }, context: { utcOffsetSeconds: 0 } })).status === 400, \"settings\");\ncheck((await call(\"/v1/read\", { ...base, sourceKey: \"moon\", settings: {}, context: { utcOffsetSeconds: 0 } })).status === 404, \"wrong source\");\ncheck((await call(\"/v1/write\", { ...base, operation: \"toString\", payload: {} })).status === 422, \"unsupported write\");\ncheck((await call(\"/v1/write\", { ...base, operation: \"calendar.rebuild\", payload: { year: \"2026\" } })).status === 400, \"non-numeric year\");\ncheck((await call(\"/v1/write\", { ...base, operation: \"calendar.rebuild\", payload: { year: 1899 } })).status === 400, \"out-of-range year\");\ncheck((await call(\"/v1/publish\", base)).status === 501, \"publish\");\n\n// The mount adds only authentication.\nconst unauth = await handler(new Request(\"https://lunar.invalid/v1/descriptor\"));\ncheck(unauth.status === 401 || unauth.status === 503, \"mount rejects a missing bearer\");\nconst token = Deno.env.get(\"SOURCE_LUNAR_V1_TOKEN\");\nif (token) {\n const authed = await handler(new Request(\"https://lunar.invalid/v1/descriptor?sourceKey=lunar\", {\n headers: { authorization: `Bearer ${token}` },\n }));\n check(authed.ok, \"mount accepts the configured bearer\");\n}\n\n// --- storage round trip ------------------------------------------------------\nawait ensureSchema();\nconst fixtureYear = 1901;\ntry {\n const count = await rebuildYear(fixtureYear);\n check(count === lunarFifteenthsForYear(fixtureYear).length, \"rebuild writes the whole year\");\n check(await rebuildYear(fixtureYear) === count, \"rebuild is idempotent\");\n\n const first = lunarFifteenthsForYear(fixtureYear)[0].dateKey;\n const [item] = await lunarItems(first, -28800);\n check(item.id === `lunar15-${first}`, \"stable id\");\n check(item.caption === \"DAY 15\" && item.mainText === \"Lunar 15th\", \"presentation\");\n // Seconds, not milliseconds, and local noon on the lunar 15th itself.\n check(item.timestamp === Date.parse(first + \"T12:00:00Z\") / 1000 + 28800, \"local noon in seconds\");\n check(civilDate(item.timestamp, -28800) === first, \"reader's day label is the 15th\");\n for (const tz of [null, 0, -43200, 50400]) {\n const [tzItem] = await lunarItems(first, tz);\n check(civilDate(tzItem.timestamp, offsetSecondsFor(tz, first)) === first, `day label at tz=${tz}`);\n }\n check((await lunarItems(\"1902-01-01\", 0)).length === 0, \"exhaustion past the ingested year\");\n} finally {\n await sqlite.execute({ sql: \"DELETE FROM lunar_fifteenths WHERE date_key LIKE ?\", args: [`${fixtureYear}-%`] });\n}\n\nconsole.log(\"PASS: Lunar calendar arithmetic, anchor convention, offsets, protocol, auth, storage and cleanup\");\n",[],[202],"03725744-0ce4-436c-9170-d5364506af6b","README.md","9c2a02bc-ab9f-11f1-aa74-1607ee4eb77e",["D",1788883931237],"# source-lunar\n\nA Clark View source that models the lunar calendar and surfaces **only** the\n15th day of each lunar month. No other lunar day is stored or served.\n\nBuilt on the shared [source SDK](https://www.val.town/x/plusjade/source-sdk):\nprotocol v1 over `rpc.ts`, bearer-authenticated, SQLite owned by this val.\n\n## The calendar model\n\nA lunar month begins on the civil day containing its new moon, so its 15th day\nis that day plus fourteen. \"Which civil day\" depends on a zone, and the calendar\nmust fix one or the same instant lands on different dates for different readers.\nThis source anchors on **UTC+8**, the conventional civil anchor for the East\nAsian lunisolar calendar.\n\nNew-moon instants come from Meeus, *Astronomical Algorithms* ch. 49, minus the\nsmall planetary terms — the residual is well under a minute, far below what a\nday boundary needs. The calendar is therefore **computed, not fetched**: there\nis no upstream provider, no egress, and nothing that can go stale or 403.\n\nTwo published dates pin the convention end to end in `check.ts`: Lunar New Year\n2026 (month 1 day 1) on 2026-02-17, and Mid-Autumn 2026 (month 8 day 15) on\n2026-09-25.\n\nLunar months are **not numbered**. Correct lunisolar numbering needs leap-month\nand solstice rules this source does not implement, and a wrong month number is\nworse than none.\n\n## Files\n\n| File | Role |\n| --- | --- |\n| `lib/lunation.ts` | Pure arithmetic: new-moon instants, civil dates, a year of 15ths. No storage, clock or network. |\n| `lunarSource.ts` | Source definition, offset policy, item text, `lunar_fifteenths` storage and `rebuildYear`. |\n| `rpc.ts` | HTTP entry: bearer authentication around `serveSource`. |\n| `ingest.ts` | Annual interval; see below. |\n| `check.ts` | Contract, calendar, offset, protocol, auth and storage checks. Disposable rows are removed. |\n\n## Settings and items\n\nSettings are exactly `{}` — there is nothing to select, and the parent's browser\nform renders no controls. One item is returned: the next lunar 15th on or after\nthe reader's current civil date.\n\n```json\n{\n \"id\": \"lunar15-2026-09-25\",\n \"mainText\": \"Lunar 15th\",\n \"subText\": \"Cycle from Sep 11\",\n \"caption\": \"DAY 15\",\n \"emphasized\": false,\n \"timestamp\": 1790362800\n}\n```\n\n(local noon on 2026-09-25 for a reader at UTC-7)\n\n`timestamp` is Unix **seconds** at the reader's local noon on that date, so the\nwidget's own day label is the lunar 15th in every timezone. The lunar 15th is a\nwhole day rather than an instant, and `caption` is set so the widget does not\nrender that anchor time as if it meant something — the same reasoning behind\nMoon's `PEAK`.\n\n`utcOffsetSeconds: null` falls back to `America/Los_Angeles`, matching Moon.\nIt is not treated as UTC.\n\n## Ingest\n\n`ingest.ts` runs on cron **`0 0 1 12 *`** — once a year, on 1 December UTC — and\nrebuilds the whole of the next year, replacing that year's rows authoritatively.\nIt also rebuilds the current year, which is normally already stored and\nidentical; including it means one run of the file is also the deployment seed,\nso there is no separate first-year bootstrap to forget.\n\nThe same work is reachable over the protocol as the write operation\n`calendar.rebuild` with payload `{ \"year\": 2027 }`, for backfilling a year out\nof band. It rejects `invalid_rebuild_payload` outside 1900–2999.\n\nThe interval runs inside this val and so writes this val's SQLite directly.\nStorage is provisioned by `ensureSchema` during ingest, never on a feed read.\n\n## Deployment\n\n1. Set `SOURCE_LUNAR_V1_TOKEN` on this val.\n2. Register in `plusjade/sports-today`: `rpc.ts`'s endpoint, source key `lunar`,\n protocol version 1, and a credential reference holding the same bearer value\n configured independently in the parent. Then assign it to a device.\n3. Run `check.ts` after any change. With the token set it also covers the\n authenticated mount; without it, everything but that one assertion still runs.\n",[],[210],["D",1788883767418],[],[155,65],"37afaef2-395e-4382-b28c-052840aec393",["D",1788883767418],"directory",[168],[155],["D",1788883743258],["D",1789492268774],{"_11":12,"_125":71},{"_11":12,"_121":-5,"_70":71,"_30":69,"_122":123,"_124":24},{"_38":112,"_13":16,"_32":35,"_113":73,"_114":-5,"_115":-5,"_116":-5,"_117":-5,"_118":-5,"_119":14,"_120":12},"ctx",{"_53":-5,"_144":262,"_263":264,"_265":266,"_267":24,"_268":24,"_269":24,"_270":86,"_271":-5,"_272":-7,"_273":-7,"_274":26,"_275":24,"_276":24,"_277":-5,"_278":24,"_279":24,"_280":24,"_281":-5},"ENV",{"_233":234,"_235":236,"_237":16,"_238":239,"_240":241,"_242":243,"_244":245,"_246":247,"_248":249,"_250":251,"_252":253,"_254":255,"_256":257,"_258":259,"_260":261},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

History · lunation.ts