Assertion: moon's period | /r/HasProperty | the time
Facets:
Source sentences:
text: : The rotational period of the Moon is the time it takes for the Moon to complete one rotation on its axis.
text: The sidereal period is the time required for a celestial body within our solar system to complete one revolution with respect to the fixed stars‹i.e., as observed from some fixed point outside the system.
text: The sidereal period of the Moon is the time needed for it to return to the same position against the background of stars.
text: But as astronomers have discovered from centuries of studying the Moon’s behavior, the Moon’s orbital period (i.e. the time it takes for the Moon to complete a single orbit around the Earth) is actually the equivalent of about 27.3 Earth days – or 27 days 7 hours 43 minutes and 11.5 seconds, to be precise.
text: As far as we know, months were first used in Mesopotamia sometime between the years 500 BCE and 400 BCE to measure the natural period related to the lunar month, or synodic month, which is the time it takes for the Moon to go through all the Moon phases.
text: The lunar calendar is a dating system based on a year consisting of synodic months (synodic period is the time that it takes for the object to reappear at the same point in the sky, relative to the Sun, as observed from Earth)- i.e., complete cycles of phases, cycles of the Moon.