telescope, planetarium, astronomy, optical telescope, astronomer, stargazer, refracting telescope, astronomical telescope, astrometry, astrophysicist, jodrell bank, satellites, seismometer, interferometer, spacecraft, hubble, epsilon aurigae, lighthouse, meteor shower, seismology, arboretum, stratovolcano, cupola, earthshine, museum, sundials, atom smasher, aurora, deimos, volcanology, spectrograph, sciamachy, spectrometer, orbiter, cassini, taurid, campanile, aurora borealis, cosmic ray, geomagnetism, syrtis major, comet, volcano, themis, collider, omega centauri, botanical garden, celestial sphere, geodesy, aristarchus, radiosonde, geodetic, aerial tramway, occultation, harlow shapley, quasars, newtonian telescope, perseids, meteoroid, minos, andromeda galaxy, celestial, foucault pendulum, rovers, vulcanology, asteroid, icecap, selene, retroreflector, rock outcrop, nebulas, moon, stargaze, astron, heinrich hertz, bell tower, exosphere, saturnian, edwin hubble, eclipsing binary, exoplanet, meteorite, aeronomy, constellations, kepler, philae, moonrise, smos, radiometer, antarctic continent, meteorological, photometer, ionosphere, astrobiology, synchronous orbit, astrophotography, photometry, landform, partial eclipse, celestial mechanics, gamma ray, titan arum, observatories, dockyard, library, mosque, zoo, manufactory, playhouse, station, synagogue, depot, gymnasium, orchestra, stadium, airport, college, foundry, hotel, lodge, shipyard, infirmary, arsenal, floor, hydrographic, multistory, storey, aeronautical, auditing, citadel, clinic, igy, manor, palace, quarantine, windowed, adjoining, astrometric, curatorial, floodlit

observation dome, widow's walk

flagstaff, observation dome, time-ball

building, construction, edifice, structure

lookout, lookout station, observation tower