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Undergraduate Research Opportunity Programme in Science
 

Summary: Undergraduate Research Opportunity
Programme in Science
CALENDARS, INTERPOLATION,
GNOMONS AND ARMILLARY
SPHERES IN THE WORK OF
GUO SHOUJING (12311314)
NG SAY TIONG
HELMER ASLAKSEN
Department of Mathematics
National University of Singapore
Semester I, 2000/2001
Introduction
In today's modern society, when we talk about calendars, almost every-
one will associate it with the Gregorian calendar, which is the calendar most
commonly used today. The Gregorian calendar is a solar calendar, which
follows the movement of the sun. It uses days to approximate the length of
the tropical year. A tropical year can be thought of as the time from one
spring equinox to the next. A year in the Gregorian calendar will approxi-
mate the time the earth takes to complete a revolution around the sun. A
year in a Gregorian calendar consists of 365 days (in most cases) divided into

  

Source: Aslaksen, Helmer - Department of Mathematics, National University of Singapore

 

Collections: Mathematics