EXPLANATION. -The white spaces show the amount of moonlight each night. January 7, February 5, etc., the moon rises at or near midnight, when the latter half of the night has moonlight; January 13, February 12, etc., the time of new moon, when there is no moonlight during the whole night; January 21. February 19, etc., the moon sets at or near midnight, when the former half of the night has moonlight; January 29, February 28, etc. time of full moon, when moonlight lasts the whole night.

Quadrature.
Opposition.
Ascending Node.
Descending Node.

By

Two heavenly bodies are in conjunction" (6) when they have the same Right Ascension, or are on the same meridian, i. e., when one is due north or south of the other; if the bodies are near each other as seen from the earth, they will rise and set at the same time; they are in **opposition' (8) when in opposite quarters of the heavens, or when one rises just as the other is setting. "Quadrature' is half way between conjunction and opposition. "greatest elongation" is meant the greatest apparent angular distance from the sun: the planet is then generally most favorably situated for observation. Mercury can only be seen with the naked eye at this time. When a planet is in its ascending" (2) or "descending" () node it is crossing the plane of the earth's orbit. The term "Perihelion means nearest, and "Aphelion' farthest, from the sun. An occultation" of a planet or star is an eclipse of it by some other body, usually the moon.

I. ECLIPSES.

In the year 1907 there will be four eclipses, two of the sun and two of the moon.

1. A total eclipse of the sun January 13-14, invisible in America. The path of total eclipse lies almost wholly in central Asia. As a partial eclipse, it will be visible over nearly the whole of Asia, eastern Europe, the eastern extremity of Africa, Japan and the northern Philippines.

East of the

2. A partial eclipse of the moon January 29, partly visible in the United States. Rocky Mountains the moon will set with the eclipse on it; on the Pacific Coast the entire eclipse will be visible.

Magnitude 0.7 on southern limb.

Local Mean Time.)

3. An annular eclipse of the sun July 10, invisible in North America; visible over the whole of South America and a portion of the south western coast of Africa.

The path of the annular eclipse enters and leaves South America in Lat. 200 S.
A partial eclipse of the moon July 24-25, visible in the United States.

4.

A Transit of Mercury over the sun's disk November 14, partly visible in the Eastern and Middle States, the sun rising with the planet on its disk.

The least distance between the centres of the sun and planet, is 12' 38.4, and occurs at 7 hours 10.9 minutes A. M. New York mean time.

At New York, the lost internal contact will occur at 8 hours 52.4 minutes A. M., and the lost external contact at 8 hours 55.0 minutes A. M. mean time.

The point of the sun's limb at which the lost external contact will take place is 15° 23' west of the north point of the sun's disk,

The duration of the transit is only 3 hours and 36.2 minutes, the planet describing only a short chord on the northern limb of the sun.

September 30 12 12 A. M.
November 9 4 37 P. M.

(Washington Mean Time.)

12 55 A.M.

5 37 P. M.

A telescope of considerable power will be necessary to view these pnenomena satisfactorily.

The earth will pass through the plane of Saturn's rings on April 12 and October 4 when they will become practically invisible.

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