Annular solar eclipse of 16 December 2085
A annular solar eclipse crosses the Earth on 16 December 2085. Along a track 10 km wide the Moon sits centred on the Sun but is too small to cover it, leaving a ring of sunlight for up to 19 s.
The numbers
- Type
- Annular solar eclipse
- Date
- 16 December 2085
- Greatest eclipse
- 22:34:58 UTC
- Eclipse magnitude
- 0.997
- Gamma
- 0.2787
- Central duration
- 19 s
- Path width
- 10 km at greatest eclipse
- Greatest eclipse at
- 7.3°S 160.8°W
See it in 3D
The simulator places the Sun, Earth and Moon at their true relative positions for this date and draws the shadow cones at real scale. You can scrub through the eclipse, drop an observer anywhere, and watch the umbra sweep the surface.
Loads about 300 KB on demand — nothing is downloaded until you press it.
Local circumstances
All times are UTC. Contact times are computed for each city from the Besselian elements against the WGS84 ellipsoid, at sea level and without refraction.
| Place | C1 | C2 | Max | C3 | C4 | Central | Obscured | Sun alt. |
|---|---|---|---|---|---|---|---|---|
| YarenNauru | 19:53:13 | — | 21:07:58 | — | 22:37:38 | — | 97.1% | 32° |
| Puerto VallartaMexico | 23:11:59 | — | 00:18:38 | — | 01:17:42 | — | 88.5% | 0° |
| Palikir - National Government CenterMicronesia | 19:49:43 | — | 20:57:18 | — | 22:16:52 | — | 87.5% | 18° |
| TonaláMexico | 23:13:11 | — | 00:18:38 | — | 01:17:08 | — | 0.0% | -1° |
| TlaquepaqueMexico | 23:13:09 | — | 00:18:38 | — | 01:17:09 | — | 0.0% | -1° |
| GuadalajaraMexico | 23:13:05 | — | 00:18:38 | — | 01:17:10 | — | 0.0% | -1° |
C1 and C4 are first and last contact, when the Moon's disc touches the Sun's. C2 and C3 bracket the central phase. 167 of the 2,250 cities in the database see at least a 3% partial eclipse.
How these figures were produced
Positions come from astronomy-engine, a VSOP87/ELP implementation. From the geocentric Sun and Moon vectors the site computes Besselian elements — x, y, d, μ, l1, l2, tan f1 and tan f2 — and solves the observer's position on the fundamental plane against the WGS84 ellipsoid. Central durations agree with NASA's Five Millennium Canon to within about half a second. Full method and validation.