Howard-Vyse, Richard William Howard: Operations carried on at the Pyramids of Gizeh in 1837: with an account of a voyage into upper Egypt, and Appendix (Band 2) (London, 1841)

APPENDIX.

109

Obliquity 1800V = 23° 27' 55"
Var. for-20007 = + 1 31

Required 1st side P P'.

2d angle P' P n.

23 29 26 s obliquity to be, and = Pn = P'D,

Solution of Triangle n P P'.

Sin. {Pn P'=Sin. 27° 52' 29". . 96G98I86

Siu. obliquity ......... 9-6005360

Sin. JPP'= 10° 44' 25" 9-2703536
P P'= 21° 28' 50".

Tan. 27° 52' 29" ... 9'7233852
Cos. obliquity ...9 9624319

Cotan. 64° f 22" ...9 6858171
Angle P'Pn= 64° 7' 22"

&Pn -
=£5= P a -

a P n -

P' P n :

P'p* -

Co8.

Tan.
Tan.

90°

30° 0' 18"

53 59 42

64 7 22

4 7

7' 40"
28 50

(0

In Triangle P'P« given P P'
P a

21 25 48
24 51 10

2 25 22

Required a P'.

9-9988720
9-5949652

9-5938372

Angle P 1 P a -

Cos. 21 28 50
Cos. 2 25 22

Cos. 21 25 48
Cos. P' « = 2 51 15

21° 28' 50"
24 51 10 = 90 ■
4 7 40

99G87359
9 9996116

9 9683475
9 9688865

9-9994610

Note.—These calculations, which take in all the influence of the secular
variations of precession, &c, may be considered quite equal, in point
of precision, to any direct observation, that an Egyptian astronomer
of that date could have made.

TABLE OF DIMENSIONS OF THE GREAT PYRAMID.

The particulars of this pyramid, and the discoveries lately
made, have been already described. The hieroglyphics in the
Chambers of Construction are inserted at page 279, Vol. I.



Feet.

Inches.

Former base - - - -

764

0

Present base *

746

0

Present height, perpendicular -

450

9

Former height, inclined - - -

fill

0

Present height, inclined -

568

3

Perpendicular height, by casing-stones

480

9

Angle of casing-stones 51° 50'.





Perpendicular height from base to bottom of entrance

49

0

Distance of the centre of this entrance eastward from the





centre of the pyramid -

24

6