Table 11: Reference Ellipsoid Constants - NorthStar 961 Reference Manual

Datum name
Reference ellipsoids
Airy (AIRY)
Modified Airy (AIRYM)
Australian National (AUSTR)
Bessel 1841 (B1841)
Clarke 1866 (CL1866)
Clarke 1880 (CL1880)
Everest (EVRST)
Modified Everest (EVRSTM)
Fischer 1960 (Mercury) (FS1960M)
Modified Fischer 1960 (South Asia)
Fischer 1968
Geodetic Reference System 1980 (GRS80)
Helmert 1906 (HELM)
Hough (HOUGH)
961/962 Operations and Reference Manual, Rev. A
Table 10: Datum list (continued)
If you need help converting lat/lon from one datum to
another, see "Table 11: Reference ellipsoid constants" below.
The reference ellipsoid constants tell you the actual size and
shape of the earth, which isn't a perfect sphere. In the table, "a"
is the distance to the center of the earth outward to the
Equator (defined in meters), and "f" is the flattening (defined as
a dimensionless quantity).

Table 11: Reference ellipsoid constants

Chapter 13 - Customizing Setup Functions
Ellipsoid delta x
(meters)
a (meters)
6377563.396
6377340.189
6378160
6377397.155*
6378206.4
6378249.145
6377276.345
6377304.063
6378166
6378155
6378150
6378137
6378200
6378270
delta y delta z
(meters) (meters)
f (flattening)
1/299.3249646
1/299.3249646
1/298.25
1/299.1528128
1/294.9786982
1/293.465
1/300.8017
1/300.8017
1/298.3
1/298.3
1/298.3
1/298.257222101
1/298.3
1/297
Page 13-19