Trace the perimeter of the sun and any sunspots that you see on the paper. Inside the circle you should see some small dark spots, which are sunspots. The image will probably be blurry focus your telescope until the circle becomes sharp.
Adjust the distance between the paper and the telescope until the disk is about the size of a small paper plate. If the distance and focus are correct, on the paper you should see a circle of light (the disk of the sun) that is brighter at the center and darker around the edges. Focus the image of the sun onto the piece of white poster board. If neither is available, you can also use an adjustable music stand. Tack a piece of white poster board to a building or tree. Project the image of the sun and trace sunspots. Any specs on the image of the sun that do not jiggle along with the image when you do this are specks in the telescope or binoculars, or smudges on the screen, and not spots on the sun itself.Ĥ. Jiggle the telescope or binoculars very slightly.Adjust its tilt until the sun’s image is circular. Move the screen toward or away from the eyepiece until the image of the sun fits neatly in the middle.One useful trick is to watch the shadow of the binoculars or telescope tube: if pointed directly toward the sun, then the sides of the tube will cast no shadows, and the instrument's shadow will be as small as it can be. Point the telescope or binoculars at the sun (do not look through the instrument to do this), as shown in the illustrations, and adjust the direction the instrument is pointing until the image of the sun appears on the screen.(If you are using a telescope, use a low-magnification eyepiece.) Focus the telescope or binocular on infinity by looking at a distant object (not the sun!) in the normal way.And, in the case of binoculars will cover the lens, which you will not use. This shades the area where the image will appear from sunlight. Make a cardboard collar to fit around the front end of the telescope or binocular, as shown in the illustrations.Set up your telescope as if you were looking at the sun, but remember to never look directly at the sun. Look at the illustration "Telescope Projector" or the illustration "Binocular Projector" for reference as you build your sun projector. Gather what you’ll need, including a telescope, a piece of cardboard, tape, white poster board, and scissors. It’s extremely dangerous! One safe way to observe sunspots in your backyard is to project an image of the sun through a telescope and onto a piece of white poster board. Cameras, however, “see” it very well, resulting in excellent images that are very different than the Ha counterparts.Never view the sun with the naked eye, or with any unfiltered optical device, such as binoculars or a telescope. Some people are able to see detail at this line, but many cannot. Many times, this is used primarily in astrophotography, as the CaK emission line sits at approximately the 393 nm wavelength, which is on the edge of the visual spectrum. The telescope restricts the bandpass of light to the Hydrogen-Alpha emission line only (656 nm wavelength), which is the spectrum in which the Sun shows much of its activity.Ĭalcium-Potassium (CaK) solar observation is also done with a dedicated module (diagonal) and a refractor much like a hershel wedge. This type of observation, however, allows for views of the granulation on the Solar chromosphere, along with views of flares and prominences on the Solar limb. Hydrogen-Alpha (Ha) solar observation is typically done with a dedicated Ha Telescope or a Quark. Herschel wedges cannot be used with reflecting telescopes.
BUILT A SUN SPOTTER FULL
Another option, if you have a refractor, is to use a Herschel wedge (also known as a Herschel Prism), which will reject the light at the eyepiece, but maintain the full spectrum of light to the eyepiece (where a white light filter will cause some blocking of certain parts of the spectrum). Typically, a white light solar filter is placed over the front of the telescope, reducing the light that hits the eyepiece. This is, by far, the cheapest option and allows you to turn your existing telescope into a solar telescope. This type of solar observation is designed to allow you to view the Solar photosphere and sunspots. With solar observation, there are different methods you will use, depending on the type of telescope you want to use and the features you want to see on the sun.
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