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Coordinates menu, under the Go To menu. The Coordinates menu also has an "Opposition Point" option, to find the point directly opposite the sun. When entering an alt/az position, you will be asked to enter the altitude first. This can range from -90 (straight down, the "nadir") to zero (a point on the horizon) to 90 (straight up, the zenith). Next, you will be asked to enter an azimuth, or "bearing". This can range from zero (due north) to 90 (due east) to 180 (south) to 270 (west) to 360 (north again). Guide will then recenter on the position given. A description of alt/az is given in the Appendices, on page 71. If the coordinates aren't being shown in the legend, or if you want other coordinates such as ecliptic or galactic to appear in the legend, you can toggle them on quite easily. This is described on page 24. A comment on entering RA/dec positions. Guide is quite willing to accept the many forms of RA/dec coordinates; for example, 10h42m36.00s N41.69 10h 42m 36s N41 41' 24" 10 42 36 +41 41 24 10h 42.6m N41 41.6' 10.71h +41 41' 24" 104236.0 +414124 all refer to the same position in the sky, and all will be correctly understood by Guide. You can leave out minutes or seconds, put spaces between fields, use +/- in place of N/S, and use decimal amounts. If Guide can't figure out what you meant, it will tell you so with an error message, and will give you a chance to try again. You can also indicate if the RA/dec you are entering is in the J2000, B1950, mean, apparent, or other epoch. Most of the time, you will probably be entering J2000 coordinates. Some older data is given in B1950, and in rare cases, you may need to enter coordinates in one of the other epochs. (The concept of an "epoch" is explained in the Appendices, page 70.) Note that this allows you to set the epoch of the coordinates you're entering, but doesn't change the epoch used for RA/dec coordinates displayed by Guide. If it's the latter you want to change, you should use the Formats dialog described on page 31. 6: GETTING INFORMATION ABOUT OBJECTS What Guide shows you on the chart is a fraction of what it knows about the objects in the chart. Since Guide can't show everything at once, you get extra data about most objects by clicking on them with the right mouse button. This gives you a quick summary of important data about the object: its name, catalog number(s), rise/set times, and so forth. You can then ask for "more info" about the object,
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