Solar eclipse

[Deuchnord]

Event type: solar eclipse
Involved objects (check the boxes):

• Sun
• Earth's moon
• Planets

Definition of the event:

A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight. This occurs when the Sun, Moon and Earth are aligned. Such alignment coincides with a new moon (syzygy) indicating the Moon is closest to the ecliptic plane. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured.
— Wikipedia

Other useful information (implementation proposal, etc): three kinds of solar eclipses have to be taken in account:

• Total eclipse: the disk of the Sun is fully obscured by the Moon
• Partial eclipse: the moon obscures only a part of the Sun's disk, forming a solar crescent
• Annular eclipse: very similar to total eclipses, but the Moon is to far away to cover the entire solar disk, making it appear as a ring.

[Deuchnord]

Removing from v0.8 milestone, because it is much more difficult to find eclipses than expected.
Looks like Skyfield has plans to support it directly, so maybe we should wait for it.

In the meantime we could implement skyfielders/python-skyfield#445.