zenithal Definition

equidistant, zenith, celestial point, azimuthal, angular distance, ecliptic, solid angle, almucantar, illuminance, sidereous, antapex, tropical year, sidereal day, astronomical year, sidereal, equinoctial point, apocynthion, sidereal year, sidereal time, solar year, equinoctially, apolune, solar telescope, illumination, equinoctial, right ascension, lucifugous, absolute magnitude, floodlight, paraboloid, plane angle, apastron, solar day, backstaff, small circle, antisolar, mean solar day, heliocentric, cosmolabe, terrestrial telescope, celestial, oblique angle, holophote, angle, geocentric, siderostat, nadir, searchlight, centre of gravity, supplementary angle, complementary angle, interior angle, pessimum, luminous flux, heliometer, line of longitude, roman deity, cosmic time, celestial equator, brightness, loxodrome, meteoroscope, equinoctial circle, clinographic, inferior planet, armil, angle of refraction, luciferous, superior planet, enfilade, interequinoctial, tropic of capricorn, coelostat, lunistice, binary system, midnight sun, clinometric, standard candle, polar coordinate, loxodromic, orthocentre, light source, apojove, simple harmonic motion, tropic of cancer, parhelic circle, sundial, coordinate axis, equiangular, reflector, agonic, evection, star chart, lucimeter, arc light, proper motion, subtense, holophotal, angle of reflection, beamful,