Astronomical Observatory- Astronomy   Telescope Prime focus, flast mirror, hour angle gear, declination axis, primary mirror, prime focus observing capsule, interchangeable end assembly, horseshoe mount, polar axis, hydrostatic pad, telescope base   Observatory dome shutter, arch , crane, windscreen, control room, girder, air intake, rotating dome, telescope, airlock , air space, exterior dome shell, rotating dome [...]

Comet, Galaxy – Astronomy Comet Nucleus, coma, gas tail, head, dust tail   Galaxy Hubble’s classification, elliptical galaxy, lentiicular galaxy, spiral galaxy, barred spiral galaxy, irregular galaxy, spiral arm, nucleus.  

Moon - Astronomy   Lunar Features Cliff, bay, ocean, lake, sea, mountain range, cirque, wall, crater   Phases of the moon new moon, new crescent,  first quarter, waxing, gibbous, full moon, waning gibbous, last quarter, old crescent  

Structure of the sun - Astronomy   Chromosphere, spicules, photosphere, corona, convection zone, radiation zone, core, flare, faculae, sunspot, filament, prominence, granulation,

Solar system-  Astronomy   Planets and Moon Sun, Deimos, Phobo, Mars, Moon, Earth, Venus, Mercury, Ganymede, Callisto, Europa, Io, jupiter Uranus, Pluto, Charon, Saturn, Titan, Neptune, Triton   Orbits of the Planets    

Celestial Coordinate System , Earth Coordinate System  - Astronomy   Celestial Coordinate System Celestial sphere, Celestial equator, vernal equinox, terrestrial sphere, South celestial pole,  North celestial pole, declination, ecliptic, right ascension, celestial meridian    Earth Coordinate System Arctic Circle, laitude, tropic of Cancer, equator, tropic of Capricorn, longitude, Antarctic Circle, North Pole, Northern hemisphere, Southern hemisphere , [...]

Constellations of the Northern/ Southern Hemisphere – Astronomy   Constellations of the Northern Hemisphere 1. Pisces, Fishes 2. Cetus, Whale 3. Aries, Ram 4. Triangulum Triangle. 5. Andromeda, Andromeda 6. Pegasus, Winged Horse 7. Equuleus, Little Horse 8. Delphinus, Dolphin. 9. Aquila, Eagle 10. Sagitta, Arrow 11. Cygnus,  Swan 12. Lacerta, Lizard 13. Cepheus, King [...]

Solar Eclipse -Astronomy Sun, Moon, Moon’s orbit, Earth,  umbra shadow, penumbra shadowm   Lunar Eclipse Sun, Moon’s orbit, umbra shadow, Moon, Earth, penumbra shadow.   Types of Eclipses total eclipse, annular eclipse, partial eclipse,   Seasons of the year Vernal equinox, , summer solstice , autumnal equinox, winter solstice spring, summer , autumn, winter