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Deep-sky™ Star Chart is a ''map'' to help you identify the constellations. You simply dial-in your observing time and date to find the set of constellations visible in your sky. We believe that it is just one of the most interesting educational things to have.
On the Front
Date and Time Start by examining the area around the perimeter of the chart. You will find the time printed for each hour of the day, with small arrows shown in-between marking the half-hours. This ‘clock dial’ serves two purposes.
The primary purpose is to be used in setting the planisphere to display the portion of the sky that is above the horizon at a selected date and time.
On the Back
The back of the Messier Observer’s Planisphere includes several tables and observing aids that will come in handy on the observing field.
Messier Object Cheat Sheet Filling the lower half of the rear side of the planisphere you will find a large table divided into three rectangular boxes.
This table lists all 110 of the objects in the Messier catalog, plus a few other notable deep sky objects.
You are probably familiar with using latitude & longitude to identify location on the earth - this is what we called ' Celestial Coordinater System'. Therefore, we have applied Right Ascension in our chart, which is equivalent of longitude.
Just as longitude describes how far east or west some place is from a fixed reference on the surface of the globe, right ascension describes how far east or west something appears on the celestial sphere.
viewing under red light
Unlike stars whose light is concentrated into a single bright point, galaxies and nebulae are extended objects whose faint light is spread across a wide area.
As a result, an astronomer can have their telescope pointed directly at an object but still be unable to see it. Hoever, there are some subtle tricks that can be used at the telescope to glimpse those faint fuzzies.