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

get

/delta-t/{date}

Authorizations

radianDriftApiKeyradiantDriftJWT

Path parameters

datestringrequired

The input date/time.

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

Responses

application/json

application/json

cURL

JavaScript

Python

HTTP

cURL

curl -L \
  --url 'https://api.radiantdrift.com/delta-t/{date}'

200

4XX

200

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