Astronomy - USA (2021-12)

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    NGC^253
    968 CGN
    8 CGN
    48
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    HOW TO USE THIS MAP
    This map portrays the sky as seen
    near 35° north latitude. Located
    inside the border are the cardinal
    directions and their intermediate
    points. To find stars, hold the map
    overhead and orient it so one of
    the labels matches the direction
    you’re facing. The stars above
    the map’s horizon now match
    what’s in the sky.
    The all-sky map shows
    how the sky looks at:
    9 P.M. December 1
    8 P.M. December 15
    7 P.M. December 31
    Planets are shown
    at midmonth
    MAP SYMBOLS
    Open cluster
    Globular cluster
    Diffuse nebula
    Planetary nebula
    Galaxy
    STAR
    MAGNITUDES
    Sirius
    0.0
    1.0
    2.0
    3.0
    4.0
    5.0
    STAR COLORS
    A star’s color depends
    on its surface temperature.


-^
The hottest stars shine blue



  • Slightly cooler stars appear white

  • Intermediate stars (like the Sun) glow yellow

  • Lower-temperature stars appear orange

  • The coolest stars glow red

  • Fainter stars can’t excite our eyes’ color
    receptors, so they appear white unless you
    use optical aid to gather more light


STAR DOME


BEGINNERS: WATCH A VIDEO ABOUT HOW TO READ A STAR CHART AT
http://www.Astronomy.com/starchart.
Free download pdf