Download or read book Astronomical Phenomena for the Year 2021 written by Naval Observatory and published by Astronomical Phenomena. This book was released on 2019-04-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This small, useful booklet contains general interest material preprinted from The Astronomical Almanac. It is published jointly by the U.S. Naval Observatory and Her Majesty's Nautical Almanac Office two years in advance of its date. It includes such things as: - dates for Solar equinoxes, solstices, phases of the Moon - eclipse maps - dates for various planetary phenomena - visibility and magnitudes of the planets - dates for some religious and civil holidays - chronological eras and cycles - the equation of time and declination of the Sun - sunrise/set, moonrise/set times - the position of Polaris.