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https://www.suntoday.org/sunrise-sunset/what-time-is-dawn.html
https://www.answers.com/Q/What_time_is_the_pre-dawn_hours
Kangaroos can see at night and are often quite active during the night time hours. That is, unfortunately, why one often finds fresh kangaroo roadkill on outback roads in the predawn hours.
https://www.dictionary.com/browse/predawn
Predawn definition, the period immediately preceding dawn. See more.
https://www.gaisma.com/en/dir/us-country.html
United States - sunrise, sunset, dawn and dusk times for the whole year in a graph, day length and changes in lengths in a table.
https://www.merriam-webster.com/dictionary/predawn
Definition of predawn. : existing or occurring before dawn a predawn attack the predawn hours … the gigantic telescope started scanning the predawn sky. — Howard Blum.
https://www.virtahealth.com/blog/dawn-phenomenon
The dawn phenomenon, sometimes referred to as the “dawn effect,” has earned its name from the recurrence of elevated blood glucose (a.k.a. sugar) around the hours of waking, roughly between 4-8 AM. This is largely caused by hormone changes, and there are several strategies that can help you reduce your fasting glucose.
https://www.timeanddate.com/astronomy/dawn.html
The Talmud defines dawn as the moment 72 minutes before sunrise. However, some Jewish communities claim that this definition pertains only to the situation in Mesopotamia on the days of the equinoxes. These groups calculate the correct moment of dawn for each day and location, based on a solar elevation angle of 16.1 degrees below the horizon.
http://wordpress.mrreid.org/2013/02/05/dawn-dusk-sunrise-sunset-and-twilight/
Dawn, or first light is 30 minutes before sunrise. So dusk is 30 minutes after sunset.
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