Questions tagged [twilight]

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At Mars' equator how long does twilight last?

With Mars' thinner atmosphere I'm assuming twilight would not last as long compared to the duration on Earth. Has there been any determination of the length of twilight on Mars at the equator or any ...
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Is astronomical twilight always seen when the sun is 18 degrees under the horizon?

Is astronomical twilight always seen when the sun is 18 degrees under the horizon or are there other factors that may influence it?