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Chart Details

  1. Right Ascension

    Specify the right ascension of the chart center, in decimal hours. The valid range is 0.0 hr. to 24.0 hr.

  2. Declination

    Specify the declination of the chart center, in decimal degrees. The valid range is -90.0 to 90.0 degrees. Omit the "+" before positive declinations.

  3. Stellar Magnitude Limit

    Specify the magnitude of the dimmest star to be plotted. The valid range is 0.0 to 7.5, with larger numbers denoting dimmer stars.

    Very small fields (i.e., views with a high Chart Magnification) generally look better with a high (i.e., dim) magnitude limit. By contrast, very wide views (Chart Magnification < 1) will often look better with a lower magnitude limit, since they will be less cluttered with dim stars.

  4. Chart Magnification

    Use this to set the magnification factor of the chart, which determines how much of the sky is visible around the chart's center point. A magnification of 1 (the default) corresponds to a displayed angle of about 60 degrees. The valid range is 0.5 (~120 degrees) to 10.0 (~6 degrees, about twice the diameter of the Pleiades).

  5. Stereo Method

    Specify the way you'd like to view the stereo image pair. Default is anaglyph (red-blue 3D glasses) images. For the
    anaglyphs, use 3D glasses with the red lens on the left side. Other options include cross-eyed and wide-eyed black-and-white stereo pairs. The black-and-white stereo pairs have more natural-looking star images, but they may be harder to see in stereo than the anaglyphs.

  6. Stereo Depth

    Specify the amount of stereo depth you'd like to see. Larger values increase the depth, as if your eyes were being spread farther and farther apart.

    Stereo depth can be tricky to optimize. Low values (< 25) give good views of the nearest stars, such as Sirius and Tau Ceti, but produce a very flat star background. High values (> 200) give a very rich background, with many stars showing great differences in depth, but make the nearest stars hard to focus on. Also, if you have chosen a high chart magnification, you will often want to use a higher stereo depth setting than normal, all else being equal.

    The valid range is 1 - 1000.

  7. Chart Size

    Specify the width of the chart in pixels. The height will be sized automatically; it will equal the chart width for the anaglyphs, and half the chart width for the stereo pairs (so two images can be drawn at a 1:1 aspect ratio). The valid range is 200 - 1200 pixels.

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