2006-09-12 11:58:33 · 7 answers · asked by mo_hef 1 in Science & Mathematics ➔ Astronomy & Space
Any perpertual calendar is designed to be able to provide the day of the week, month, and so on for any particular year you could name. It usually involves just some simple calculations to determine which of 14 one-year calandars to use for the particular year in question. They've been around since at least the 1100's.
The word 'retrograde' probably means that your particular device is capable of calculating for years in the past instead of years in the future.
Hope that helps!
2006-09-12 12:52:01 · answer #1 · answered by Doctor Why 7 · 0⤊ 0⤋
Retrograde Calendar
2016-11-10 21:59:58 · answer #2 · answered by fipps 4 · 0⤊ 0⤋
I guess "retrograde" is a type of hand movement that only move in a segment of circle ,not full circular path (like fuel gauge indicator ).
the retrograde perpetual calendar is a perpetual calendar that show date or month in retrograde-type movement.
2015-06-23 21:19:53 · answer #3 · answered by tanapong 1 · 0⤊ 0⤋
it is a precise time and calendar instruments used in making fine and expensive watches, such as Rolex.
2006-09-12 12:12:57 · answer #4 · answered by Sam X9 5 · 0⤊ 0⤋
It is a very expensive watch.
2006-09-12 12:05:29 · answer #5 · answered by Barkley Hound 7 · 0⤊ 0⤋
Some pretty good arguments.
2016-08-23 06:41:15 · answer #6 · answered by ? 4 · 0⤊ 0⤋
I don't really know how to answer this
2016-07-27 12:35:17 · answer #7 · answered by Anonymous · 0⤊ 0⤋