Astronomy

Sky

Celestial Sphere

  • Basic Coordinates & Seasons
  • Celestial Navigation Net
  • Celestial Sphere
  • Coordinate Systems in Astronomy
  • How You Can Get the Approximate Sidereal Time
  • Introduction to Spherical Astronomy
  • Measuring Distance Via the Parallax Effect
  • Measuring the Sky: Quick Guide to the Celestial Sphere
  • Parallax Effect
  • Precession of the Equinoxes
  • Retrograde Motion of Planets
  • Rotating Sky
  • Seasons & the Zodiac
  • Small Angle Formula
  • Trigonometric Parallax
  • Top of Page
  • Observing

  • Almanac, Sky & Telescope
  • Astronomical Observing with Unaided Eye
  • Hawaiian Terms for Stars, Planets and Space
  • In the Sky
  • Night Sky in the World
  • Observing Highlights, Sky & Telescope
  • Occultations, Sky & Telescope
  • PlanetDiary
  • Planet Positions
  • Saving Dark Skies, Sky & Telescope
  • Sky at a Glance, Sky & Telescope
  • Star Finding with a Planisphere, Sky & Telescope
  • Space Environment Center
  • Space Weather
  • Using a Naked Eye Star Map, Sky & Telescope
  • View Sky from Cities Around the World
  • Visual Observing, Sky & Telescope
  • Top of Page
  • Tours

  • Cosmicdust
  • Daily Almanac
  • Nightwatch
  • Object Seasonal Observability
  • Qué tal in the Current Skies
  • Sky Eye
  • Sky Tonight
  • This Week's Sky
  • Tonight's Sky
  • Variable Star Calendar
  • What's Up
  • Top of Page
  • Telescopes

  • Above the Clouds: Telescopes on Mauna Kea, WGBH, 2009
  • Astronomical Observing with Telescopes
  • Eyes on the Skies (1a): New Views Of The Skies
  • Eyes on the Skies (1b): New Views Of The Skies
  • Eyes on the Skies (2): Bigger is Better
  • Eyes on the Skies (3): Technology to the Rescue
  • Eyes on the Skies (4): From Silver to Silicon
  • Eyes on the Skies (5): Seeing the Invisible
  • Eyes On The Skies (6): Beyond Earth
  • Light, Optics, & Telescopes
  • Simplest Telescopes
  • Telescope Basics
  • Telescopes & Binoculars, Sky & Telescope
  • Telescope Formulas
  • World's Largest Optical Telescopes
  • X-ray Telescopes
  • Top of Page
  • Hubble

  • Hubble Deep Field, Hubblesite
  • Hubble Galaxies Across Space and Time, Hulu
  • Hubble's Hottest, Volume I, Hulu
  • Hubble's Hottest, Volume II, Hulu
  • Hubble's Hottest, Volume III, Hulu
  • Hubble's Hottest, Volume IV, Hulu
  • Hubble Movies, HubbleSite
  • Hubble Presentation
  • HubbleSite
  • Hubble's Hotties
  • Hubble Ultra Deep Field 3-D
  • Piercing the Sky, Hubblesite
  • Top of Page
  • Charts

  • 3-D Star Maps
  • Atlas of the Universe
  • Caldwell Catalog
  • Deep Sky Database
  • Down Under Sky Maps in Adobe Acrobat
  • Interactive Sky Charts
  • National Geographic Star Journey Star Attractions
  • National Geographic Star Journey Star Chart
  • NGC Objects
  • Sky Chart, Sky & Telescope
  • Skymaps.com
  • Sky View Cafe
  • Sloan Digital Sky Survey
  • Stars by Bright Star Catalog Order
  • Star Database
  • Star Gazing Basics, Sky & Telescope
  • Stellar Database
  • Your Sky Object Catalogs
  • Top of Page
  • Constellations

  • Alphabetical Listing of Constellations
  • Basic Facts About the Classical Constellations
  • Classical Mythology
  • Constellations
  • Constellation Families
  • Constellations to Know
  • Constellation List
  • Constellations by Month
  • Constellations & Their Stars
  • Constellation Visibility
  • Hawai'i Constellations
  • List of Constellations
  • Meeks' Constellations
  • Modern Constellations
  • StarDate Online Constellations
  • Star Myths & Constellations Lore
  • Tour of Orion, the Hunter
  • What are Constellations?
  • Your Sky Object Catalog: Constellations
  • Top of Page
  • Messier Objects

  • Listing of Messier Objects
  • Meeks' Messier Objects
  • Messier Catalog
  • Top of Page