Sentence:  <WSD>Lunar</WSD> eclipſes are not quite ſo complicated in theory, nor near ſo tedious and difficult in calculation, as ſolar ones. The latter are only apparent, the former really ſuch; that is, the Moon is really deprived of its light, and therefore muſt appear obſcured to all the inhabitants of the earth equally, by whom ſhe can be ſeen; whereas the Sun, not being deficient in light, will ever appear reſplendent to thoſe who do not happen to live on that part of the earth where the <WSD>lunar</WSD> ſhadows pass. 
Meaning of the word marked with <WSD> tags:  Of, pertaining to, or resembling the Moon (that is, Luna, the Earth's moon); Lunar.