Julian date, modified Julian date, day number, Greenwich mean sidereal time and
Julian date, modified Julian date, day number, Greenwich mean sidereal time and local sidereal time for a timestamp and longitude
Answeringour last check, 2026-10-20
1 of 1checks answered this week
496 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/astronomy/julian-date
| Category | Everything else |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-20 | valid payment request | 402 | $0.01 | 496 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"lon": "-75",
"time": "2000-01-01T12:00:00Z"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"lon": {
"description": "optional longitude for local sidereal time",
"type": "string"
},
"time": {
"description": "optional ISO 8601 time, default now",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"day_of_year": {
"description": "Day of year",
"type": "number"
},
"gmst_degrees": {
"description": "Gmst degrees",
"type": "number"
},
"gmst_hours": {
"description": "Gmst, in hours",
"type": "string"
},
"julian_centuries_since_j2000": {
"description": "Julian centuries since j2000",
"type": "number"
},
"julian_date": {
"description": "Julian date",
"type": "number"
},
"julian_day_number": {
"description": "Julian day number",
"type": "number"
},
"local_sidereal_time": {
"description": "Local sidereal time at the given longitude, or null",
"properties": {
"degrees": {
"description": "Local sidereal time in degrees",
"type": [
"number",
"null"
]
},
"hms": {
"description": "Local sidereal time as hours:minutes:seconds",
"type": [
"string",
"null"
]
},
"longitude": {
"description": "Longitude in decimal degrees",
"type": [
"number",
"null"
]
}
},
"type": [
"object",
"null"
]
},
"modified_julian_date": {
"description": "Modified julian date",
"type": "number"
},
"note": {
"description": "Caveat or context for reading the result",
"type": "string"
},
"source": {
"description": "Data source the values come from",
"type": "string"
},
"time": {
"description": "Time",
"type": "string"
},
"unix_seconds": {
"description": "Unix, in seconds",
"type": "number"
}
},
"required": [
"julian_date",
"gmst_degrees"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}