Solar calendar
A solar calendar is a calendar based on the position of the earth in relation to the sun. There are tropical solar calendars.
There are non-solar calendars like sidereal calendars and lunar (moon) calendars As well as hybrids including lunisolar calendars, a hybrid of solar days and lunar months.
Other websites
Jewish Calendar
Correspondence between Hebrew and Islamic calendars, months and holidays (pdf)
Calendars
Astronomy