HELIOMETERS
Definition
HELIOMETERS is the plural of HELIOMETER.
noun HELIOMETER: an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope.
HELIOMETERS is the plural of HELIOMETER.
noun HELIOMETER: an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope.