heliometric


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he·li·om·e·ter

 (hē′lē-ŏm′ĭ-tər)
n.
A telescope equipped to measure small angular distances between celestial bodies or the angular sizes of celestial bodies.

he′li·o·met′ric (-ə-mĕt′rĭk), he′li·o·met′ri·cal adj.
he′li·o·met′ri·cal·ly adv.
he′li·om′e·try n.