When Was the Sextant Invented?
When Was the Sextant Invented? The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was...
Read MoreWhen Was the Sextant Invented? The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was...
Read MoreWhat Is Twilight? Twilight is the faint light which appears a little before sunrise and again after sunset before it gets really dark. On the Moon there is no twilight....
Read MoreWhat Makes People from Different Parts of the World Have Different Skin Colors? People noticed long ago that people from different parts of the world often had...
Read MoreWhere Did Calendars Begin? Early in history man began counting time by days, months and seasons and so had the beginnings of a calendar. When he studied the supposed...
Read MoreWhat Was the Phoenix? The phoenix was, according to legend, a bird which died in a fire but came out of the flames alive. In ancient Egypt the phoenix was connected...
Read More