Refracting Telescope

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refracting telescope = optical instrument that uses an objective lens to observe celestial bodies

celestial bodies = see here (https://t.me/espedition/771)

declination = the angular distance of a point north or south of the celestial equator(= the great circle on the celestial sphere midway between the celestial poles)

graduated = marked with divisions indicating degrees or units of measurement

magnify = make smth appear larger than it is, especially with a lens or microscope

ascension = rising to a higher point

clamp = a device used to hold two things together tightly


See also

Reflecting Telescope  (https://t.me/espedition/1040)

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.