This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 Excerpt: ...lunation, and arises from the circumstance of the Lunar day being greater than the Mean Solar day, and including it within its limits. In the present instance, the excess is 0b 52m-l, or the lunar day is equal to24h 52m.l Mean Solar time; the Moon passes the meridian on the 25th at 23h 44m-9, or 15m.l previously to the ...
Read More
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 Excerpt: ...lunation, and arises from the circumstance of the Lunar day being greater than the Mean Solar day, and including it within its limits. In the present instance, the excess is 0b 52m-l, or the lunar day is equal to24h 52m.l Mean Solar time; the Moon passes the meridian on the 25th at 23h 44m-9, or 15m.l previously to the noon of the 26th, and does not return to the same meridian until 0h 37m-0 after the noon of the 27th. For the same reason there is also one day in every lunation on which the Moon does not transit the lower meridian, and this happens about the time of opposition, or when the difference of longitude of the Sun and Moon is 180. In the list of Moon-culminating Stars, at pages 480 to 521, the days on which only one transit occurs are readily seen. On February 26th (page 486), for instance, it appears that the Moon transits the lower meridian only, while on March 14th (page 488), the only transit is that at the upper meridian. To find the Mean Time of Transit under any other Meridian, suppose 45 or 3h West of Greenwich, on January 15, 1854. The Meridian being to the West of Greenwich, the Transit will take place after the Greenwich time of Transit on the 15th; therefore take the difference between the Meridian Passages on the 15th and 16th, which is 0h 47m-4. Then, 24h: 0h 47m.4:: 3h: 5m-9, which added to the Greenwich Mean Time of Transit gives 13h 38m-6 for the Mean Time of Transit at the given Meridian. Had the assumed Meridian been 3h to the East of Greenwich, the Transit would have taken place before the Transit at Greenwich, and the proportional part of the difference between the 14th and 15th, must in this case have been subtracted. The times thus deduced are only approximate; but they are sufficiently accurate for the purposes usually requ..
Read Less
Add this copy of The Astronomical Ephemeris; Volume 1854 to cart. $73.43, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2019 by Wentworth Press.
