The Nautical Almanac and Astronomical Ephemeris for the Year 1861

The Nautical Almanac and Astronomical Ephemeris for the Year 1861

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1857 edition. Excerpt: ... rule: --Convert the interval from the mean noon immediately preceding, from the denomination given, to that required; and if mean time be required, the result will at once be that which the clock should show; but if sidereal time be that sought, the result must be added to the sidereal time at the preceding moan noon. Example: --To convert 2ih gm 2404 sidereal time, January 2,1861, into mean solar time, for the meridian of Greenwich, hm Sidereal time given----------21 9 2404 Sidereal time ai mean noon, January 2----18 48 2488 Interval in sidereal time from mean noon----2 20 5916 Retardation of mean on sidereal time for the interval--2310 Mean solar time required--------2 20 3606 which is the interval elapsed since mean noon, expressed in mean time; and therefore the time which ought to be shown by a mean time clock. Vice versa," to convert 2h 20m 36s 06 mean solar time, January 2, 1861, into sidereal time for the same meridian. h m Mean interval from mean noon, January 2---2 20 36 06 Acceleration of sidereal on mean time for the interval + 23 10 Sidereal interval from mean noon------2 20 5916 Sidereal time ai mean noon, January 2----18 48 2488 Sidereal time required----------21 9 2404 which ought to be the time shown by the sidereal clock at the instant in question. If the place of observation be not on the meridian of Greenwich, the sidereal time must be corrected by the addition of 9s '8565 for each hour (and proportional parts for the minutes and seconds) of longitude, if the place be to the west of Greenwich; bat by its subtraction, if to the east. Thus in 9' iom 6s west longitude, the sidereal time at mean noon, January 2, instead of being, as in the foregoing Example, i8h 48m 24 "88, must be corrected by adding im...
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Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • United States
  • English
  • black & white illustrations
  • 1236844483
  • 9781236844484