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Planetary Science > Astronomical twilight

The following information is about Astronomical twilight.

Astronomical twilight Defined

The time when the Sun is 12-18 degrees below the horizon. When the Sun moves from 19 to 18 degrees below the horizon, astronomers can begin to detect an increase in the brightness of the sky, although to the naked eye the sky still looks dark.

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Off-site Astronomical twilight Links, User Submitted

The following links have been collected through user bookmark submission in the Astronomical twilight category. Please note, because these resources are off-site we cannot guarantee the accuracy or quality of any information.

Mon Mar 17

If you would like to find additional social bookmark based links on the topic of we recommend the Open Tag Directory > Astronomical twilight. If you would like to find related tags we recommend Tag Patterns > Astronomical twilight

Off-site Astronomical Twilight Research Links

If you still need additional information on Astronomical Twilight then we suggest the following off-site resources. Please note, because these resources are off-site we cannot guarantee the accuracy or quality of any information.

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