Philip's Astronomy Encyclopedia by Eugene H. Ehrlich

By Eugene H. Ehrlich

First released in nice Britain in 1987 through Mitchell Beazley
less than the name The Astronomy Encyclopedia (General Editor
Patrick Moore)
This absolutely revised and accelerated version first released in 2002 by
Philip’s, an imprint of Octopus Publishing Group.

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It varies throughout the year by as much as 16 minutes because of the elliptical orbit of the Earth and the fact that the Sun appears to move across the sky along the ecliptic, rather than the celestial equator. Clock time is therefore based on the uniform movement of a fictitious mean Sun. The difference between apparent and MEAN SOLAR TIME is called the EQUATION OF TIME. apparition Period of time during which it is possible to observe a celestial body that is only visible periodically. The term is usually used to describe a particular appearance of a comet, such as the 1985–86 apparition of Comet HALLEY.

Communications satellites weighing up to 6 tonnes are being launched to GTO. On some flights, two smaller satellites can be launched together, reducing the launch cost for the customer. An Ariane launch costs in the region of US$100 million. 4 tonnes into GTO, with one model with no strap-on boosters and five with two to four solid or liquid boosters or combinations of these. Ariane 5 can place 6 tonnes into GTO. 1 and 12 tonnes. Ariel Icy SATELLITE of URANUS, discovered in 1851 by William LASSELL.

This organization published the first ‘AGK’ catalogue of 200,000 fundamental stars in 1887. Argelander step method Visual method of estimating the magnitude of a VARIABLE STAR, based upon assessing the ease with which the variable may be distinguished from individual comparison stars. The arbitrary steps thus derived (known as ‘grades’) may subsequently be used to obtain the variable’s magnitude. The method has the advantage of being relatively objective, in that the magnitudes of any comparisons are unknown at the time of making the estimate.

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