Delta-T

The Delta-T end point obtains an estimated Delta-T value in seconds for the given date.

The returned values are from the following sources:

• Up to year 2004: Meeus, Astronomical Algorithms, 2nd Ed. p.79 Table 10.A

• 2006 - 2024: source

• 2024 - 2034: source

• After 2034: we implement these expressions

For further context, see Delta T.

Return estimated delta-T for the given date

GEThttps://api.radiantdrift.com/delta-t/{date}

Authorization

radianDriftApiKeyradiantDriftJWT

Path parameters

date*string

The input date/time.

Example: "2024-10-15T22:00:00.000Z"

Response

200

Body

application/json

query*object

response*object

Request

JavaScriptCurl

const response = await fetch('https://api.radiantdrift.com/delta-t/{date}', {
    method: 'GET',
    headers: {},
});
const data = await response.json();

Response

{
  "query": {
    "name": "delta-t",
    "date": "2024-10-15T22:00:00.000Z",
    "cost": 1
  },
  "response": {
    "deltaT": 69.08631831
  }
}