CONTENTS.

LECTURE I.—THE SUN.

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Determination of the Sun ’s distance from the Earth —By means of Transitsof Venus—By the Eclipses of Jupiter’s Satellites—By Observations ofthe Planet Mars—And by other Methods.1

LECTURE II.—THE SUN ( continued).

Description of the Spectroscope—Its Use in Solar Observations—Promi-nences and Spots upon the Sun —Relation of Sun -spots to Magneticand Meteorological Phenomena—The Corona and its Long Streamers—

The Sun ’s Temperature.20

LECTURE III.—THE MOON .

The Moon 's Distance from the Earth—Methods by which the Moon isweighed—The Moon ’s Orbit—Its Phases and Librations—The Extentof the Moon ’s Surface seen from the Earth.49

LECTURE IV.—THE MOON ( continued ).

Lunar Mountains—Their Varied Forms and Telescopic Appearance—Vol-canic Action, Past or Present, upon the Moon —The Lunar Atmosphere—Photographs of the Moon—Lunar and Solar Eclipses —The Moon and Navigation —The Moon and Easter —The Moon and the Weather . 09

LECTURE V.—PTOLEMY versus COPERNICUS .

The Apparent Paths of the Planets seen from the Earth —The PtolemaicTheory—Its Cycles and Epicycles—The Copernican Theory—The Orbitsof the Planets—Kepler's Three Laws—Bode’s So-called Law of Distances—The Phases of an Inferior Planet—The Retrogression and the Stationsof the Planets .

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