1 solar day is equal to 24 hours.
1 solar day is equal to 24 hours.
1 solar day is equal to how many hours?
24 hours
rare earth's assertion that the moon's stabilization of earth's obliquity and spin is a requirement for complex life has been questioned. kasting argues that a moonless earth would still possess habitats with climates suitable for complex life and questions whether the spin rate of a moonless earth can be predicted. although the giant impact theory posits that the impact forming the moon increased earth's rotational speed to make a day about 5 hours long, the moon has slowly "stolen" much of this speed to reduce earth's solar day since then to about 24 hours and continues to do so: in 100 million years earth's solar day will be roughly 24 hours 38 minutes (the same as mars's solar day); in 1 billion years, 30 hours 23 minutes. larger secondary bodies would exert proportionally larger tidal forces that would in turn decelerate their primaries faster and potentially increase the solar day of a planet in all other respects like earth to over 120 hours within a few billion years. this long solar day would make effective heat dissipation for organisms in the tropics and subtropics extremely difficult in a similar manner to tidal locking to a red dwarf star. short days (high rotation speed) causes high wind speeds at ground level. long days (slow rotation speed) cause the day and night temperatures to be too extreme.
rare earth hypothesis
earth's rotation period relative to the sun (solar noon to solar noon) is its "true solar day" or "apparent solar day". it depends on earth's orbital motion and is thus affected by changes in the eccentricity and inclination of earth's orbit. both vary over thousands of years, so the annual variation of the true solar day also varies. generally, it is longer than the mean solar day during two periods of the year and shorter during another two. the true solar day tends to be longer near perihelion when the sun apparently moves along the ecliptic through a greater angle than usual, taking about longer to do so. conversely, it is about shorter near aphelion. it is about longer near a solstice when the projection of the sun's apparent motion along the ecliptic onto the celestial equator causes the sun to move through a greater angle than usual. conversely, near an equinox the projection onto the equator is shorter by about . currently, the perihelion and solstice effects combine to lengthen the true solar day near by solar seconds, but the solstice effect is partially cancelled by the aphelion effect near when it is only longer. the effects of the equinoxes shorten it near and by and , respectively.
earth's rotation