Download Astronomy with Binoculars by James Muirden PDF

By James Muirden

ISBN-10: 0690017235

ISBN-13: 9780690017236

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Now return to the inferior planets, which present a prime consideration here is their altitude shows two eastern sunset: one on March 21, the other on September special problem: the above the horizon elongations at 23$° at sunset or sunrise. Fig. 23 Fig. 9. DEC. 22 The ecliptic MAR. 21 JUNE21 ASTRONOMY WITH BINOCULARS 36 »VENUS HORIZON Fig. 10. Note Evening elongations in spring that the planet's direction of setting and autumn parallel to the celestial equator, is not to the ecliptic. 21. In both cases the angular distance from the Sun but the spring sunset is in the is obviously far north-bound part of the more ecliptic, is the same, favorable; the planet while in autumn it is in the south-bound region.

Reappearance, of course, is the reverse. Occultations occurring at the dark limb are espeorbital — cially spectacular, for the lunar disk is naturally invisible against the sky, and the star disappears or flashes out in the fraction of a second. This suddenness forms an incidental proof that the Moon's atmosphere is virtually nonexistent, for a slight trace of would produce a flickering and fading some time before the air true disappearance. Table 2 Forthcoming Lunar Eclipses TIME VISIBILITY (UT) MAGNITUDE UK USA 1979 Sep 6 10-54 11 No Partly 1981 Jul 17 04-48 0-6 Partly Yes 1982 Jan 9 19-56 1-4 Yes No Jul 6 07-30 1-7 Dec 30 11-26 1-2 Yes Yes Yes No No DATE 08-25 0-3 No No No 4 19-57 1-2 Partly Oct 28 17-43 11 Partly 1983 Jun 25 1985 May THE MOON The Observer's Handbook lists all 31 favorable occultations, but it must be remembered that the glare of the Moon will prevent all but the brightest stars from being observable near the lunar glare.

The planet will appear as a bright binocular object some 1 1° above the horizon and about 9° southwards of the center of the twilight though it is easily spotted at a favorable elongation. lished the favorable glow. This assumes an elongation of 20° from the Sun. Once located, there From should be no southern States difficulty in seeing its altitude will be it with the unaided eye. somewhat greater, and, can be followed into a darker sky. Given the setting later, it essentials of a low horizon and clear weather, the innermost planet is much most people seem to imagine.

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