Stellar, solar, and lunar demonstrators Rosa M. Ros, Francis Berthomieu International Astronomical Union Comm C1 Technical University of Catalonia, Spain CLEA, France Goals
Understand the apparent motions of stars as seen from different latitudes. Understand the apparent motions of
the Sun as seen from different latitudes. Understand the Moons movement and shapes as seen from different latitudes Stellar demonstrator for showing:
Paths of the stars in the sky
Circumpolar stars, stars that rise and set, stars that dont rise or set Travel anywhere if you know the latitude (You can build a simulator for each location) circumpolar / stars that rise & set/stars that
dont rise or set Stellar demonstrator Stellar demonstrator for Northern Hemisphere Stellar demonstrator for Southern
All explanations are given for construction depending on: Northern hemisphere Southern hemisphere
Building instructions step 1 Make a photocopy on heavy-weight paper Cut both pieces (big one and small one) along the continuous
line Remove the black areas Building instructions step 2
Cut a small notch above the N (northern hemisphere) in the horizon disk or the S (southern hemisphere) in the horizon disk Glue the North-East quadrant (northern hemisphere) of the horizon disk onto the grey quadrant of the main piece. The W
point must match up with latitude 90, or the South-West quadrant (southern hemisphere) of the horizon disk onto the grey quadrant of the main piece. The E point must match up with latitude 90. Try to be careful in this operation because the
Building instructions step 3 Fit the incision N (northern hemisphere) in the quadrant over the degrees of latitude or the incision S (southern hemisphere) in the quadrant over
the degrees of latitude Hold the horizon disk perpendicular to the latitude degrees Begin to use by setting it for any desired latitude Tilts of stellar
paths Lat 70 Enonte ki Finland Lat 41 Montse
ny Spain Lat 23 Matehu ala Mexico Where is sunrise?
Is this picture correct? The sunrise is always due East and the sunset is always due West. Is this correct?
with another demonstrator Solar demonstrator for showing: Daytime solar path Annual motion of the sun Study risings and settings
Midnight Sun Travel anywhere if you know the latitude Solar demonstrator Northern hemisphere Solar demonstrator
Southern hemisphere Solar motions Suns path
Place N at proper latitude Place marker at proper date Move date arm to show suns path throughout a day
Note positions of rise/set Slope of the Suns path Lat 70 Enonte
ki Finland Lat 40 Gand a Spain Lat 5
Ladrill ero Colomb ia Height of the solar path Summer and Winter in Norway
Sunrises/sunsets in different places Riga, Latvia Barcelona, Espaa Popayn,
Colombia winter spring autum n
summe r Polar summer and winter At the poles, the sun is above the horizon for half a year
and below it for half a year. Midnight Sun The Sun goes down until it passes the meridian and then begins to rise rather than set below the horizon
Seasons at the equator The solar path is always almost perpendicular to the horizon and its length is almost the same throughout the year
Sun at the zenith At solar noon, the shadow is on your feet. Lunar demonstrator Why the Moon smiles
in some places? Why yes or no. Lunar demonstrator XXL demonstrators
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