Calendar Wiki
Explore
Main Page
All Pages
Community
Interactive Maps
Recent Blog Posts
Obsolete
Hindu calendar
Julian calendar
Egyptian calendar
Maya calendar
More...
Proposed
New Roman Lunisolar Calendar
World Season Calendar
TheAbysmal Calendar
More...
Ethnic/National
Chinese calendar
Assyrian calendar
Hebrew calendar
Bengali calendar
Solar term
More...
Community
Recent blog posts
Forum
Chat
FANDOM
Fan Central
BETA
Games
Anime
Movies
TV
Video
Wikis
Explore Wikis
Community Central
Start a Wiki
Don't have an account?
Register
Sign In
Sign In
Register
Calendar Wiki
590
pages
Explore
Main Page
All Pages
Community
Interactive Maps
Recent Blog Posts
Obsolete
Hindu calendar
Julian calendar
Egyptian calendar
Maya calendar
More...
Proposed
New Roman Lunisolar Calendar
World Season Calendar
TheAbysmal Calendar
More...
Ethnic/National
Chinese calendar
Assyrian calendar
Hebrew calendar
Bengali calendar
Solar term
More...
Community
Recent blog posts
Forum
Chat
Editing
Calendar
(section)
Back to page
Edit
Edit source
View history
Talk (0)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
===Accuracy Types === Calendars have different ways of maintaining accuracy. Either they can refer directly to observations or just use an arithmetic rules. An [[astronomical calendar]] is based on observation; examples are the religious [[Islamic calendar]] and the old religious Jewish calendar in the time of the Second Temple. Such a calendar is also referred to as an ''observation-based'' or ''pragmatic'' calendar. The advantage of such a calendar is that it is perfectly and perpetually accurate. The disadvantage is that working out when a particular date would occur is difficult. An [[arithmetic calendar]] is one that is based on a strict set of rules; an example is the current Jewish calendar. Such a calendar is also referred to as a ''rule-based'' or ''theoretical'' calendar. The advantage of such a calendar is the ease of working out when a particular date occurs. The disadvantage is imperfect accuracy. Furthermore, even if the calendar is very accurate, its accuracy perishes slowly over time owing to the slowing of Earth's rotation and the gradual changes in the length of the tropical year and the synodic month. This limits the lifetime of an accurate theoretical calendar to a few thousand years. After then, the rules would need to be modified from observations made since the invention of the calendar, resulting in a mixed calendar.
Summary:
Please note that all contributions to the Calendar Wiki are considered to be released under the CC-BY-SA
Cancel
Editing help
(opens in new window)
Follow on IG
TikTok
Join Fan Lab