Astronomy Answers
AstronomyAnswerBook: periods

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This page lists questions about "periods" that are answered elsewhere. Select a question to go to its answer. The questions are:

• [490] With which periods does the solar activity vary?
• [462] How can one predict occultations and transits of the moons of Jupiter from their synodical periods?
• [461] How can one calculate the synodical periods of the moons of Jupiter from their sidereal periods?
• [420] An astrologer offers a prediction, in exchange for money, for a period with favorable financial opportunities. I am inclined to take the offer, because there's no harm in believing in it. Or is there?
• [311] Why are the spin period and orbital period of the Moon equal to one another?
• [294] If you divide the year (orbital period) of a planet such as Mars into 12 months where each month corresponds to 30 degrees of motion around the Sun, and the year begins at the ascending equinox, then what is the length of each month?
• [152] What are the rotation periods (days) of the planets?
• [147] How do eclipsing binary stars periodically get brighter?
• [66] What are the periods of the planets?

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Last updated: 2018-02-01