are there calendars which use both the sun and the moon?
Yes, the Gregorian calendar.
Lunar calendar
The most commonly used calendar, the Gregorian calendar, is a solar calendar system that originally evolved out of a lunar calendar system.
where did the tropical storm zelda strike? The Marshall Islands where is this place located? It is  near the Equator in the Pacific Ocean, slightly west of the International Date Line. what is the date line? It is an imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole. what is its purpose? It demarcates the change of one calendar day to the next. mention its significance in any major religion. In Islam, the day for holding the "Jumu'ah" prayer appears to be local Friday everywhere in the world. is there a specific calendar pertaining to this religion? Yes, the Islamic calendar. what are the applications? It is used primarily for religious purposes, and for official dating of public events and documents in Muslim countries. what are the important dates in it? UNANSWERABLE is it based on the sun or the moon? The moon - lunar calendar could you please elaborate on how it is done? Conversions may be made by using the Tabular Islamic calendar, or, for greatest accuracy (one day in 15,186 years), via the Jewish calendar. how long is a month in this? Each month can have 29 or 30 days. what is its cultural significance? UNANSWERABLE
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Lunar calendar [SEP] Introduction
A lunar calendar is a calendar based on the monthly cycles of the Moon's phases (synodic months), in contrast to solar calendars, whose annual cycles are based only directly on the solar year. The most commonly used calendar, the Gregorian calendar, is a solar calendar system that originally evolved out of a lunar calendar system. A purely lunar calendar is also distinguished from a lunisolar calendar, whose lunar months are brought into alignment with the solar year through some process of intercalation. The details of when months begin varies from calendar to calendar, with some using new, full, or crescent moons and others employing detailed calculations.