almanacs is a form of:

Almanac



noun
1.
(calendar with astronomical or other data a table of days, weeks, and months, etc. that gives information about the weather, sunrise, and sunset, important anniversaries, etc. during that period) មហាសង្ក្រាន្ដ
ENGLISH MEANING
noun
1.
A book or table, containing a calendar of days, and months, to which astronomical data and various statistics are often added, such as the times of the rising and setting of the sun and moon, eclipses, hours of full tide, stated festivals of churches, terms of courts, etc.