![]() The altitude is then observed from the time it was seen to 12 hours later.) And thus, with his numbers, he can then find out the star’s ascension and declination. ![]() A star very near the pole may put out a trace of a small circle. 321 Meridian, definition 273 Meridian convergency 289 Meridian. (The celestial equator – which is 90 degrees from the celestial poles – can help with this. basic aircraft 144-149 Latitude definition 286, 287 LCD displays 66, 82, 83, 84. He must then find out where and when his meridian crosses with the first point of Aries. Using this device, the astronomer must take care to measure two things: he must measure the time a star crosses his meridian (an invisible, imaginary great circle on a celestial sphere), and he must also measure the angle of his telescope’s tilt for him to see said star. These telescopes are not portable as these are the big ones you see on round dome observatories. To track a star or to point toward a part of the sky requires a special instrument – an astronomer’s telescope called the transit circle. Meridian astronomy, in particular, is used to make correct measurements in the sky so that celestial bodies (stars, planets, etc.) can be charted – an astronomical time-keeping system of sorts. a system of broadcasting using this method. Not many people know that they are also used as terms in the field of astronomy. amplitude modulation: a method of impressing a signal on a radio carrier wave by varying its amplitude.
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