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| Star Spangled Globes Fourth of July, 2001 |
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Q: When I am in Maine, I have used a planisphere to determine what
stars are viewable. Is this antique one the same thing?
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 Click image for full description and enlargement |
Yes. The constellations come into view at different times of the year, and depending on where you are on earth. This American 19th Century planisphere shows the constellations on a revolving disc, and is designed so that by setting the revolving dial for month, day, and time at night, you know what stars are visible in the Northeast United States. This particular one, designed by Henry Whitall of Philadelphia in the 1870s, is calibrated for the latitude of Philadelphia and New York. If you were at a different latitude, you would need a different planisphere. |
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