Astronomical & geographical essay: containing, I A .. view,on a new plan, of the general principles of astronomy II The use of the celestial and terrestrial globes .. III The description and use of the most improved planetarium, tellurian, and lunarium IV An introduction to practical astronomy . ^ ^6 25, and his azimuth 1, tion being 23 29. ^?^ /is the cofme oi the funs « • ?%. tion 23 29 Is to the cofine of the altitude 4625 : So is the fine of the azimuth112 59, or 67 i A21 9-96245^70 . p / To the fine of the horary angle 43 47 »3 - 9-S40I039 As i5to 1, fo is 43 47 13 to 2 55 ^\the a
Astronomical & geographical essay: containing, I A .. view,on a new plan, of the general principles of astronomy II The use of the celestial and terrestrial globes .. III The description and use of the most improved planetarium, tellurian, and lunarium IV An introduction to practical astronomy . ^ ^6 25, and his azimuth 1, tion being 23 29. ^?^ /is the cofme oi the funs « • ?%. tion 23 29 Is to the cofine of the altitude 4625 : So is the fine of the azimuth112 59, or 67 i A21 9-96245^70 . p / To the fine of the horary angle 43 47 »3 - 9-S40I039 As i5to 1, fo is 43 47 13 to 2 55 ^\the apparent or true time part noon, to 9* 4 52before noon ; but neither of thefe times willagree with a watch which meafures timeequally. The equation of time for noon at Green-wich is i i$>g^\ the daily difference 13;therefore, as 24 is to ii^\ fo is 255 8^ ; confequently ^ added to i , ori ^, is the equation of time to be added 541 riON TO fi 2 5s S added tothe time pafl noon per y to remark, that when- c equation of time to that I from calculation, you , iS the Nautical Ephemeris 1 IX ..xd time is not very near noon, make a proportion as above ; but if ply the equation of time to the time per you muft fubtradt where the ephemeris J you to add, and vice verfa. I d. 542 nrrjHf^f^fifV M PRACTICE A - OF EQUATO OR A21 Q^JPt^mJn*^^ UJVIFERSAL SUJV-D ** AND ITS USES THE plumb-line, or direftion in whicLvity a6ls, being the only line we can at (^J^A-2times have immediate rccourfe to, for determin- - r-^ing the pofitionof objeds, is the chief particular]to which the circles in the inftrument laft de-1fcribed are adapted; and accordingly their planesare placed the one parallel, and the other perpen-dicular to that line. But as there are few placeson the earth, whofe vertical or horizontal circledGorrefpond with thofe in which the celeflial mo-tions are performed, it was found neceffary, at avery early period, to conftrud inftruments a-dapted not only to the meafurem
Size: 1953px × 1279px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthor, bookcentury1800, bookdecade1800, booksubjectastronomy
