Astronomical Julian Date
Compute the astronomical Julian Date (JD, fractional, epoch noon 1 Jan 4713 BC) and Modified Julian Date (MJD = JD − 2400000.5) of a UTC instant. Unlike `calendar`'s integer Julian Day Number, this carries the time-of-day fraction.
| Host | astro.openverbs.com |
|---|---|
| Price | $0.004 per call |
| Network | Base |
| Paid endpoints listed | 4 |
| Calls, last 30 days* | 6 |
| Most unique payers on one endpoint (30 days)* | 2 |
| Last paid call* | 2026-10-08 |
| Tags | julian date calculator, modified julian date, utc to julian date, astronomical jd api, compute mjd, sunrise sunset api, solar noon calculator, day length lookup |
* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.
Endpoints
| URL | Method | Price |
|---|---|---|
https://astro.openverbs.com/v1/julian-dateCompute the astronomical Julian Date (JD, fractional, epoch noon 1 Jan 4713 BC) and Modified Julian Date (MJD = JD −… | POST | $0.004 |
https://astro.openverbs.com/v1/sunCompute sunrise, sunset, solar noon and day length for a latitude/longitude (east-positive) and date, using the NOAA… | POST | $0.004 |
https://astro.openverbs.com/v1/seasonDetermine the astronomical season for a date, based on the Sun's apparent ecliptic longitude (0°=March equinox,… | POST | $0.004 |
https://astro.openverbs.com/v1/moon-phaseCompute the Moon's phase name, age in days since the last new moon and illuminated fraction (0..1) for a UTC… | POST | $0.004 |
Source: x402 Bazaar discovery API (Coinbase CDP) · Licence: Public discovery metadata; descriptions by each provider. Listed in x402 pay-per-call APIs. We list tools; we do not test, rate or endorse them.
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