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Wazzat Mean - Peterborough Astronomical Association
Wazzat Mean - Peterborough Astronomical Association

... Unit-Power Finder A device for aiming your telescope that shows the sky as it appears to your unaided eye, without magnification. The simplest type is a pair of notches or circles that you line up with your target. Other versions use an LED to project a red dot or circle onto a viewing ...
Ay 122a Fall 2012 – HOMEWORK #1
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... 3. Thinking Big... Suppose you are put in charge of designing a 30m optical/IR telescope, and that the baseline configuration is a Ritchey-Chretien design with with a primary focal ratio of f/1.0. Suppose that the final ratio at the R-C focus is f/15 (this would probably be a Nasmyth focus for this ...
Low-budget satellite tracking system for highly elliptical orbits
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... the failure of AO-40. But who knows, maybe there will be a successor in the near future. If that happens and if you are not one of those who can already call a full-size satellite tracking system their own, you might be interested in just getting started by taking our approach. The idea: In order to ...
AST 443/PHY 517 Homework 1 Solutions
AST 443/PHY 517 Homework 1 Solutions

... 4. Which of these 5 stars is closest to the moon? What is the angular distance? Sirius, at about 44.3 degrees 5. The sidereal time at midnight advances by 3m 56s each day. What are the best days to observe these targets? See column (3) above. 6. What is the minimum zenith distance for each star? Se ...
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1 - GEOCITIES.ws

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AST 443/PHY 517 Homework 1
AST 443/PHY 517 Homework 1

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No Slide Title
No Slide Title

... latitude from the CE, i.e., the declination of the zenith is your latitude. Any vertical line on your SC-1 (north-south) is a meridian. Approximately one half of the stars on the SC-1 are visible at any given time (12 hours of RA). ...
PHY216_lect1_2014 - Astrophysics Research Institute
PHY216_lect1_2014 - Astrophysics Research Institute

... The Euclidean cosine rule can also be recovered by the same method. ...
5.1-The process of Science - Homework
5.1-The process of Science - Homework

... • The duration of one rotation of the Earth, or occassionally another celestial body, on its axis. Its is measured by successive transits of a reference point on the celestial sphere over the meridian, and each type takes its name from the reference used… www.reson.com/Gloss-d.htm • 1. A basic time ...
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Meridian circle



The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a transit, while at the same time measuring their angular distance from the nadir. These are special purpose telescopes mounted so as to allow pointing only in the meridian, the great circle through the north point of the horizon, the zenith, the south point of the horizon, and the nadir. Meridian telescopes rely on the rotation of the Earth to bring objects into their field of view and are mounted on a fixed, horizontal, east-west axis.The similar transit instrument, transit circle or transit telescope is likewise mounted on a horizontal axis, but the axis need not be fixed in the east-west direction. For instance, a surveyor's theodolite can function as a transit instrument if its telescope is capable of a full revolution about the horizontal axis. Meridian circles are often called by these names, although they are less specific.For many years, transit timings were the most accurate method of measuring the positions of heavenly bodies, and meridian instruments were relied upon to perform this painstaking work. Before spectroscopy, photography, and the perfection of reflecting telescopes, the measuring of positions (and the deriving of orbits and astronomical constants) was the major work of observatories.
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