| Civil twilight at the equator lasts longer than at 60 NM or 60°S because the radius of the equator is larger than the radius of the 60°parallel. |
| The duration of the civil twilight on 21st of march and on 23rd of September is equal at all places on Earth independent of latitude. |
| The declination of the Sun and the latitude of the observer will affect the duration of civil twilight. |
| Only the declination of the Sun will affect the duration of civil twilight. |
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