
The Heavens in July, 1916
The Orbit of Wolf's Comet

The Heavens in July, 1916
The Orbit of Wolf's Comet

The Heavens in June, 1916
New Method of Determining the Distance of a Star

The Heavens in May, 1916
The Great Globular Cluster of Stars in Hercules

The Heavens in April, 1916
Remarkable Surface Features of the Planet Mars

The Heavens in March, 1916
Our Neighbor Mars and Its So-Called "Canals"

The Heavens in February, 1916
Our Interesting Neighbor, Mars

The Heavens in January
The Coming Lunar and Solar Eclipses

The Heavens in December, 1915
The Light of the Sun as Compared with That of Other Stars

The Heavens in November, 1915
The Lesser Members of the Solar Family

The Heavens in October 1915
Brightness of the Moon's Light; How and Why it Varies

The Heavens in September 1915
New Light on Variable Stars; Positions of the Planets

The Heavens in August
A Study of Short Period Variables

The Heavens in July
A Hundred and Twenty Thousand Years Hence the Tides will have Lengthened Our Day by One Second

The Heavens in June
Studying the Acceleration of the Moon

The Heavens in May
Determining the Difference in Longitude Between Washington and Paris

The Heavens in April
Nebulæ; Their Nature, Dimensions and Distances from Us

The Heavens in March
Measuring the Distances of the Nearer Stars

The Heavens in February
Determining the Weights of Molecules and Atoms by Astronomical Observations

The Heavens in January - January 2, 1915
Weighing and Measuring a Star 200 Light Years Distant from the Earth

The Heavens in December
The Heat We Receive from the Stars

The Heavens in November
Transit of Mercury Across the Face of the Sun

The Heavens in October
Ninth Satellite of Jupiter Discovered; Visibility of Delavan's Comet

The Heavens in September
New Information About the Brilliant and Massive Stars of Scorpio

The Heavens in August
The Solar Eclipse and the Theory of Relativity--Another Comet Found