This well-schooled text provides a detailed description of how to perform practical astronomy or spherical astronomy. It is an authoritative source on astronomical phenomena and calendars.

The Fifty Year Almanac of Astronomical Events: 2021 to 2070 is a catalog listing a wide range of solar system phenomena as seen from Earth. Each year gives a concise compendium of the most conspicuous and/or significant astronomical events involving the Sun, Moon and the planets. The astronomical events include the following. - solar and lunar eclipses - phases of the Moon - apogees and perigees of the Moon - Equinoxes and Solstices of Earth - aphelion and perihelion (Earth, Mars, Jupiter, Saturn and Uranus) - oppositions and conjunctions of the planets - elongations of Mercury and Venus - close conjunctions of the Moon with the planets and bright stars - close conjunctions of planets with bright stars and other planets - peak of major meteor showers The date and time of each event is given in Greenwich Mean Time (= Coordinated Universal Time). With 200+ events each year, the Fifty Year Almanac includes over 10,200 astronomical events.

This accessible reference presents the evolution of concepts of time and methods of time keeping, for historians, scientists, engineers, and educators. The second edition has been updated throughout to describe twentieth- and twenty-first-century advances, progress in devices, time and cosmology, the redefinition of SI units, and the future of UTC.

The calculation of exact positions of stars, the Sun and the celestial bodies of the solar system is a prerequisite of successful practical work in astronomy. This text gives the necessary background of spherical astronomy and celestial mechanics from the practitioner's point of view, and collates all the formulae and numerical values needed to calculate precise ephemerides. The clear structure of the book allows easy use of the material in computer programs. Students, lecturers and amateurs in astronomy will find the book an invaluable reference in their daily work, lectures or lab courses.