Lectures on select subjects in mechanics, hydrostatics, pneumatics, and optics. With the use of the globes, the art of dialing, and the calculation of the mean times of new and full moons and eclipses / By James Ferguson.

  • Ferguson, James, 1710-1776.
Date:
1760
Catalogue details

Licence: Public Domain Mark

Credit: Lectures on select subjects in mechanics, hydrostatics, pneumatics, and optics. With the use of the globes, the art of dialing, and the calculation of the mean times of new and full moons and eclipses / By James Ferguson. Source: Wellcome Collection.

    463/486 (page 407)
    • Now, as the defcending node is juft oppofite the afcending, (viz, 6 figns diftant from it) and the tables fhew only how far the fun has gone frona the afcending node, which, by this example, ap¬ pears to be 6 figns, 9 deg. 32 min. 34 fee. it is plain that he muft be eclipfed *, being then only f 32^ ' 34^^ fliort of the defcending node* EXAMPLE V. ^he moon will he full on the iith of September 17614^. at 7 hours 40 min. pafi noon. (See Example IL) IVhether Jhe will be eclipfed at that time f Sun from node. To the year after Chriji^s birth 1753 Add compleat years —— (fum 1764; And r September \ II days - i 7 hours L40 minutes so/// I 28 O 19 7 2 3 56 8 12 22 49 II 25 29 18 II I 44- Sun’s diftance from the afc. node 5 24 12 28 Which being fubtraded from 6 figns, leaves only 47' remaining : and this being all the fpace that the fun is fliort of the defcending node, it is plain that the moon muft then be eclipfed, be- caufe flie is no farther from the contrary node.