ay45c2-page1 - 2 The Astronomical Context Here we learn...

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Unformatted text preview: 2 The Astronomical Context Here we learn more about available types of astronomical data, in order from easy to dicult. 2.1 Angular and positional measurements 2.1.1 Angles between objects measured \on the sky" { i.e., in projection θ θ View in Sky Cross Section View We can usually measure small angles (< 1) much better than large angles, (say, 45). We nd accuracies of: Optical   0.00001 best Radio   0.00000001 best (Very-Long Baseline Interferometry (VLBI)) X-ray   200 limited by spacecraft -ray   1 limited by properties of -ray detectors Useful conversions:  1 = 600 = 360000  1 radian = 57:3 = 206; 00000 10 ...
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