The distribution of stars is really random, it requires a lot of imagination to figure out something out of them. They are purely artificial pictures making up by observers. The connecting lines between the brighter stars trace out some kind of object. However, the pattern should be approximately valid during the viewing season when adjustments are taken on the shift in day and difference in location. This free sky charts software is offered by Cartes du Ciel.įigure 08-01p shows the signposts of 4 different seasons on a particular day, time, location, and direction as indicated in the images. Figure 08-01o shows the same chart in horizon coordinate facing North. The name of each object (if not already shown) can be obtained byįigure 08-01n Sky Chart, Computer Generatedįigure 08-01o Sky Chart, Horizon CoordinateĬlicking the pointer (such as NGC2539 in the sample chart). Outline of the Milky Way can be plotted on the chart. It can display the ecliptic as well as the Galactic equator. The detail of objects can be adjusted by the user. It allows the user to specify any location and date/time as shown in Figure 08-01n, which displays a chart tailored to a "Sample" with latitude 42 o and longitude 270 o at 22:00 h on January 20, 2004. Sky charts computer software is perhaps the most versatile. It will show the correct direction by rotating 180 o when it is held over head to compare with the actual sky view.įigure 08-01l Sky Chart įigure 08-01m Star Finder The East and West are switched in the chart. The right ascension is marked at the outer-most circle. The transparent cursor scale (from -50 o to 90 o) is used to calculate the declination of celestial objects. This particular view is set at 22:00 h, January 20. The time and date of viewing can be selected by rotating the disc around the center. An oval opening in an overlapping disc represents the heavens as seen from a certain latitude, e.g., 45 oN. An one piece sky chart plots the sky with the North Pole at its center (see Figure 08-01m). It has a legend to show the various objects in the sky and the apparent magnitude of the objects.įigure 08-01l shows the Northern sky at 50 o latitude at midnight for the beginning of the four seasons. The sky charts in Figure 08-01j,k divide the sky of the Northern Hemisphere in January into two quadrants one facing North, the otherįigure 08-01j Sky Chart, North įigure 08-01k Sky Chart, South These are for use in the South Pacific, Australia, New Zealand, South America, and southern Africa. The Southern Hemisphere charts usually depict the sky from a latitude of 35 oS. North or south of this) - suitable for viewing in the United States, Canada, Europe, and Japan. The Northern Hemisphere charts usually show the sky from a latitude of 45 oN (usable for latitude 10 to 15 degrees Those in the book are usually presented in a series of 12 months. There are many ways to produce a sky chart for viewing astronomical objects in the night sky.
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