oa MNASSA : Monthly Notes of the Astronomical Society of South Africa - Time
|© Publisher:||Astronomical Society of Southern Africa (ASSA)|
|Journal||MNASSA : Monthly Notes of the Astronomical Society of South Africa|
|Publication Date||Jun 1941|
|Keyword(s)||Length of solar day, Mean Solar Time, Star day, Sun-dial, Transit instruments, True solar (sun-dial) time and Varying relationships|
From the earliest days, time has boon connected with sunrise and sunset. Midway between sunrise and sunset the, sun bears neither east nor west, that is, it is on the meridian. This is a well-defined instant and, as soon as pointers had been set up in the meridian, was used by astronomers to mark the commencement of a solar day.
Article metrics loading...