Free public APIs.

The next full moon (date, UTC time, traditional name, supermoon flag, days until) plus the next 12 upcoming full moons.

curl https://furiosadata.com/api/next-full-moon

{
  "next": {
    "date": "2026-07-29",
    "iso": "2026-07-29T14:35:12.000Z",
    "name": "Buck Moon",
    "supermoon": false,
    "daysUntil": 20
  },
  "upcoming": [ ... 12 items ... ]
}

The next solar or lunar eclipse (type, date, max-eclipse UTC time, visibility region) plus the next total solar eclipse.

curl https://furiosadata.com/api/next-eclipse

{
  "next": {
    "date": "2026-08-12",
    "type": "Total Solar",
    "maxTimeUTC": "17:46",
    "visibility": "Greenland, Iceland, N Spain"
  },
  "nextTotalSolar": { ... }
}