TABLE XIV.-Astronomical Refraction.

The Mean Refraction is for Barometer 30 inches and Temperature 50° Fahr.

NOTE.-If the Barometer is over 30 inches the Barometer correction is additive to the Mean Refraction.

If the Thermometer is less than 50° the Thermometer correction is additive to the Mean Refraction.
And vice versa.

The sun's horizontal parallax varies during the year from 8"-95 to 8"-65.
The above is a mean value, sufficiently exact for all topographical purposes.

(5455)

2 L 2

TABLE XVI.

Lat.

TABLE XVII.

Longitude by Occultations.

CORRECTION of the Moon's EQUATORIAL PARALLAX for the figure of the EARTH.

Horizontal Parallax.

58'