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Mercury spins slowly on its axis and completes one rotation every 59 Earth days. But when Mercury is moving fastest in its elliptical orbit around the Sun (and it is closest to the Sun), each rotation is not accompanied by sunrise and sunset like it is on most other planets.
Despite its small size and slow 59-day-long rotation, Mercury has a significant, and apparently global, magnetic field. According to measurements taken by Mariner 10, it is about 1.1% the strength of Earth's. The magnetic-field strength at Mercury's equator is about 300 nT.
The best time to catch Mercury is within a week or so of its greatest elongation: this is when Mercury appears to be at its farthest distance from Sun as seen from Earth. These periods occur twice every 116 days or so (roughly every four months). Greatest elongation west is when Mercury is farthest from the Sun in the morning sky.
20 de oct. de 2023 · Mercury’s year (the time it takes to orbit the Sun one time) is 88 Earth days long. Rotation: Although Mercury goes around the Sun quickly, it spins very slowly on its axis — about 59...
