Definition
DefinitionThere are three types of twilight; Astronomical, Nautical and Civil.
From a scientific perspective, twilight is defined according to the position of the Sun
The Sun , a G V star, is the star at the center of the Solar System. The Earth and other matter orbit the Sun, which by itself accounts for about 98.6% of the Solar System’s mass….
(its centre) relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (brightest), nautical twilight and astronomical twilight (darkes
| Definition | Position of sun |
| degrees below the horizon | |
| Night | more than 18° |
| Astronomical twilight | 12° – 18° |
| Nautical twilight | 6° – 12° |
| Civil twilight | less than 6° |
| Day | (sun above the horizon) |
For comparison, the angular diameter of the Sun is 0.5°.
