The Sun

II.

Synoptical Table of the Planetary System.*

Diameters and bulk: those of the earth considered as unity.

Bulk or Value.

Mercury

Venus

The Earth

The Moon

Mars

Vesta

Juno

Ceres

Pallas

Jupiter

Saturn

Uranus

Rotation, or Sidereal Day.

Diameter.

111.45

- 1,384,462.

0

Laplace, Système du Monde. Biot, Astronomie Physique.

Half the greater Axis of the Orbits of the planets; or their mean distances from the Sun, in Myriametres, each containing 32809 English feet.

The relative proportion of the eccentricity to the half of the greater

The eccentricity of Pallas proves, that, notwithstanding the identity almost of its mean distance with that of Ceres, the orbits of these two planets are very distant from each other at their aphelion and perihelion. Between these points, the orbits intersect each other. Pallas sometimes approaches Jupiter and sometimes Mars.

N. B.-We do not in these Tables take any notice of the effects of the refraction, which increases the duration of the day, particularly towards the poles. Under the pole itself the refraction alone, independent of the twilight, increases the day, which is six months long 67 hours.

IV.

Table of the Decrease of the Degrees of Longitude, according to the ancient or nonagesimal graduation, the Earth being supposed to be spherical.

Table of the Decrease of the Degrees of Longitude, according to the New or Centesimal Graduation, the Earth being considered as Spherical.