Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 177
of total echpses then ending and being succeededby about 10 partial echpses. There will therefore be in allabout 20 partial eclipses and 44 or 45 total eclipses, the cyclecomprising altogether about 1,200 years. 82. Lunar Eclipses.—In Fig. 48, ^S^ and E represent thecentres of the Sun and Earth… … Fig. 48.—To illustrate a, Lunar Eclipse. light from the Sun : this portion of the shadow is called theumbra. Between the umbra and the cone, bounded by theinternal tangents, is a region at any point of which the Hghtfrom only a portion of the Sun is cut off: this portion of theshadow is called the…
Astronomy
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