Mercury's 88-day cycles
The length of daytime on Mercury equals 88 Earth days, which requires a person to wait about three months before sunset. Russian researcher Sergey Yozef also pointed out that June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere, while daylight hours are equal on some planets due to their vertical axial tilts. It is worth mentioning that daytime length varies greatly among the planets; for example, it is 58.5 days on Venus, and only five hours on Jupiter.
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