12. Constellations come, and climb the heavens, and go, And thou dost see them rise, Star of the Pole! and thou dost see them set, Alone, in thy cold skies, Thou keep'st thy old unmoving station yet.

54. Astronomy Picture of the Day The Constellation Orion

71. Labeling Constellation

73. Bayer System Systematic method to name all the stars that we see. Names the brighter stars by assigning : 1. constellation (using the Latin possessive of the name) 2. Greek letter (Alpha, Beta, Gamma, Delta, Epsilon,...) Labeled in an approximate order of decreasing brightness for stars in the constellation.

74. Bayer System Example Orion Constellation

76. Bayer System Example Orion Constellation Betelgeuse is also called Alpha-Orionis Rigel is called Beta Orionis

80. Circumpolar Constellations Constellations that appear year long in the sky Big dipper Little dipper Draco Camelopardalis Cepheus Cassiopeia

102. The Zodiac The constellations that fall on the ecliptic.

108. Star Charts and Coordinate Systems

109. Astronomy Picture of the Day A Star Cluster in the Rosette Nebula

110. Astronomy Picture of the Day This striking pair of galaxies is far, far away... about 350 million light-years from Earth.

111. Astronomy Picture of the Day The Constellation Orion

113. The changing stars The stars we see change with time of night and season of year The sky is a sphere with Earth at the center. Observer can see only sky above the horizon horizon……..an imaginary plane tangent to Earth at the observer

116. Earth and Sky Terms Latitude….LINES PARALLEL TO THE EQUATOR Longitude……LINES THAT RUN FROM POLE TO POLE Prime Meridian…RUNS FROM POLE TO POLE THROUGH….... ……….Greenwich England

117. How do you use latitude and longitude ? 1.They are both measured in degrees. 2.Latitude can be no more than 90 degrees and longitude can be no more than 180 degrees. 3.You always say latitude before longitude (ex. North West, South East) 4.When talking about only latitude or only longitude, include the word after the measurement (ex. 44 degrees latitude, 132 degrees longitude)

119. Celestial sphere Terms North Celestial Pole….same as North pole South Celestial Pole….same as South pole Celestial Equator……….Projection of earth’s equator out to the sky

130. altitude - the angle of a star above the horizon The North Star, Polaris, is not the brightest star in the sky but remains in a fixed position in the sky. The angle of Polaris above your horizon is the same as your latitude in degrees.

134. Right Ascension R.A. Distance measured eastward along the celestial equator from zero point, called the vernal equinox measured in hours and minutes ……. 15hr 10 min, 23 hr, 5 min

137. Declination Dec Angular distance above or below the celestial equator measured in degrees…. 0 o, 15 o, 30 o

141. Create own Celestial Sphere

142. SC002 Star Chart The North Star The Big Dipper The Little Dipper Cassiopeia.

143. SC001 Star Chart Little dipper Cepheus Draco Orion Gemini Find the coordinates of Betelgeuse.

144. Earth and Sky Terms Right Ascension Declination Ecliptic Vernal Equinox Autumnal Equinox Summer Solstice Winter Solstice

148. Motions of the Sun and Stars Daily Motion Annual Motion.

149. Motions of the Sun and Stars Daily Motion –The rising and setting of the stars is caused by the Earth’s rotation about its axis.

150. Horizon Calendar June (Summer Solstice) March & September (Equinoxes) December (Winter Solstice)

151. Stonehenge

153. Astronomy Picture of the Day Cosmic wreckage from the detonation of a massive star is the subject of this official first image from NASA's Chandra X-ray Observatory. August 27, 1999

154. Motions of the Sun and Stars Annual Motion –The Earth’s orbit around the Sun causes different stars and constellations to be visible at different times during the year.

160. The Ecliptic The Sun’s apparent yearly path among the stars. Tip the equatorial circle by 23.5° around a line passing through the Earth

162. Diurnal Motion rotation of Earth from west to east causes objects on celestial sphere to appear to rise in east and set in west daily

173. Solar Day The time it take for the earth to make one complete rotation Takes 24 hours

174. Sidereal Day One rotation of the earth measured by the position of the stars It takes 23hours 56 minutes

179. Seasons What causes seasons on Earth? Answer: The tilt of the Earth's rotational axis. Ecliptic: The path of our Sun across the celestial sphere is called the. It is inclined 23½° with respect to the celestial equator.

180. Earth and Sky Terms Right Ascension Declination Ecliptic Vernal Equinox Autumnal Equinox Summer Solstice Winter Solstice

182. Inclined Pole causes Seasons