11 48 A.M
2 13 P.M
9 40 A.M
11 43 P.M.

1 10 A.M.
4 47 A.M
4 25 P.M.
7 27 A.M.

4 43 P.M.
6 8 P.M
9 33 P.M.
4 56 P.M.

10 12 A.M

6 8 A.M

2 37 A.M.
4 51 A.M.

5 0 A.M. 4 58 P.M 9 7 A.M

7 31 P.M 11 55 P.M.

3 8 A.M. 6 19 P.M. 12 52 P.M. 5 26 P.M.

NEW YORK. WASHINGTON. CHARLESTON.

1 19 P.M.

6 54 A.M.

8 8 A.M.

8 15 A.M.

H. M.

7 24 A.M. 4 16 P.M. 9 46 A.M. 12 36 A.M 11 45 P.M.

12 15 A.M
11 35 P.M
10 2 P.M.

1 36 P.M. 7 31 A.M. 2 46 P.M 5 52 P.M. 12 41 A.M.

3 16 P.M. 6 39 AM. 10 43 A.M. 9 23 A.M.

11 36 A.M.
2 1 P.M.
9 28 A.M.
11 31 P.M

12 58 A.M.
4 35 A.M.
4 13 P.M.
7 15 A.M.

4 82 P.M.

5 56 P.M

9 21 P.M.
4 44 P.M.

12 38 A.M. 12 26 A.M. 12 14 A.M.
10 47 P.M.
10 35 P.M.
10 23 P.M.
12 6 A.M.21d 11 54 PM.21d 11 42 P.M.21d 11 31 P.M.21d 11 0 P.M.
4 49 P.M.
3 43 P.M.

12 3 A.M.
10 12 PM.

5d 11 32 P.M.
9 41 P.M.

4 37 P.M.

4 25 P.M.

4 14 P.M.

10 O A.M

5 56 A.M.
2 25 A.M.

4 39 A.M

4 48 A.M. 4 46 P.M. 8 55 A.M 7 19 P.M. 11 43 P.M.

2 56 A.M. 6 7 P.M. 12 40 P.M. 5 14 P.M.

H. M.

7 12 A.M. 4 4 P.M. 9 34 A.M. 12 24 A.M. 11 33 P.M.

7 P.M.

6 42 A.M.
56 A.M.
3 A.M.

7 1 A.M.
3 53 P.M.
9 23 A.M.

8 52 A.M.

12 13 A.M.22d 11 42 P.M. 10 51 P.M.

22 P.M.

1 13 P.M.
7 8 A.M.
2 23 P.M.
5 29 P.M.
12 22 A.M. 30d

2 53 PM. 6 16 A.M 10 20 A.M. 9 0 A.M.

wy

11 13 A.M.
1 38 P.M
9 5 A.M
11 8 P.M.

12 35 A.M.
4 12 A.M.
3 50 P.M.
6 52 A.M

4 9 P.M.

5 33 P.M.

8 58 P.M.

4 21 P.M.

9 37 A.M

5 33 A.M

2 2 A.M.
4 16 A.M.

CHICAGO.

4 25 A.M

4 23 P.M.
8 32 A.M.

6 56 P.M.
11 20 P.M.

2 33 A.M. 5 44 P.M. 12 17 P.M. 4 51 P.M.

H. M.

6 30 A.M 3 21 P.M.

12 44 P.M.
6 19 A.M.
7 33 A.M.
7 40 A.M.

11 21 A.M. 10 41 P.M. 9 8 P.M.

12 42 P.M.

6 37 A.M.

1 52 P.M. 4 58 P.M. 11 51 P.M.

2 22 P.M.

5 45 A.M.

9 49 A.M. 8 29 A.M.

10 42 A.M
1 7 P.M.
8 34 A.M
10 37 P.M.

12 4 A.M. 3 41 A.M. 3 19 P.M. 6 21 A.M.

3 38 P.M.

5 2 P.M.

8 27 P.M.

3 50 P.M.

9

6 A.M. 5 2 A.M. 1 31 A.M. 3 45 A.M.

3 54 A.M.

3 52 P.M. 8 1 A.M.

6 25 P.M. 10 49 P.M.

2 2 A.M.. 5 13 P.M.. 11 46 A.M.. 4 20 P.M..

12 13 P.M. 5 48 A.M. 2 A.M. 9 A.M.

13

14

15

ཋཋE ཀྐ ཀྐ རྨ བ མྨ སྶ ས་ ་བིཡྻམ ་

16

17

18

20

21

22

23

24

25

26

27

28

29

30

31

EXPLANATION. -The white spaces show the amount of moonlight each night. January 1, March 1, etc., full moon, when moonlight lasts the whole night; January 7, February 6, etc., when the moon rises at or near midnight, when the latter half of the night has moonlight; January 15, February 14, etc., new moon, no moonlight during the whole night; January 23, February 22, etc., the moon sets at or near midnight, when the first half of the night has moonlight.

Star Table.

POLE STAR.

MEAN TIME OF TRANSIT (AT WASHINGTON) AND POLAR DISTANCE OF POLARIS.

54

JUNE.

To find the time of the star's transit add or subtract, according to the sign, the numbers
Lower Transit of Pole Star is 4 h. 45 m. 4s. A. M. to which add
in the second column of figures to the date of the transit of the pole star given above. Thus,
for a Andromeda February 1.
10 h. 40 m. and we have 3 h. 25 m. 48. P. M.; for December 1, we find 7 h. 81 m. 22 s. P. M., etc.
PRINCIPAL FIXED STARS.
APPROXIMATE PARALLAX AND DISTANCE IN LIGHT-YEARS OF SOME OF THE
Light 435
Parallax.
By light-years is to be understood the number of years light requires to travel from the star to us.
Light
Years.

Years.

18

The determination of stellar parallax is one of the most difficult and refined problems in practical or observational astronomy. It is to find the angle which the semi-diameter of the earth's orbit subtends at the star-an angle always very small, as seen from the above table, and which cannot be measured directly, but by various processes too complicated to be explained here. To

"

14732.420
5767.6696

87.96925
224.70080

3548.192
1886.5182
299.1256

365.25636
686.97987
4332.6284

120.4548

10759.2225

42.2308

30688.5022

21.530 60178.3060

At
Unit
Distance.

"

15 59.6

3.34
8.55

Mean
Dally
Motion.

3.

ELEMENTS OF THE SOLAR SYSTEM.

O

"

"

O

/

"

115 4 3.26 76 5 10.9
165 4 20.94 130 19 58.0
99 47 20.22 101 25 37.7
70 45 5.47 334 26 21.8
242 24 21.96 12 54 18.0

53 23 10.90 91 19 26.1
294 57 2.33 169 14 25.8
111 24 32.14] 43 51 38.2
Epoch 1912 January Od Greenwich mean time.

SEMI-DIAMETER.

At Mean
Least
Distance.

"

5.05

. 37.16

1 21.17

33.5
38.7

Mean Longitude Mean Longitude
at the
Epoch.*

of the
Perihelion.

The Sun.
The Moon.

Mercury.
Venus.
The Earth.

Eccentricity

.of Orbit.

Sidereal
Revolution-
Days.

0.2056167

0.0068150

0.0167460

0.0933198

0.0483570

0.0558482

0.0470781
0.0085410

5.45 30.90

*9.64 23.12 9.55

1.84

1.33

In
Miles
(Mean).

Synodical
Revolution-

Days.

Mean.

43758.03
36558.86

15096.43

17411.34

0.387099 0.466693
0.723331 0.728260!
1.000000
1.523688
5.202803 5.454395
9.538838 10.071570
19,190978
30.070672

115.877

583,920

779,936

398,866

378.090
369,650

367.482

Annual
Sidere.
Motion.

DISTANCE FROM THE SUN.
Astronomical Units.
Grea test.

"

+5.7 + 0.4 +11.6 +15.9 + 7.6 +20.2 + 7.4 -18.9

Volume.
-1

Mars.
Jupiter.
Saturn.
Uranus.
Neptune.

0.307505
0.718402

1.016746 0.983254
1.665877 1.381499
4.951211
9.006106

20.094454 18.287502
30.327506) 29.813838

Least.

Annual
Sidereal
Motion.

"

7.6 -17.9

Density.
R
- 1

-22.2
-13.9

-18.9

-32.0

10.7

D.
432183.68 1303371.8 329390 0.2527 25
1504.24 0.054955 0.054898 0.99895
3850.67 0.921875 0.807328 0.87574
1.000000 1.000000 1.00000
2274.37 0.189953 0.106478 0.56055

1352.809 314.4985
788.934 94.0684

0.23247
0.11923
55.550 14.4033 0.25928
85.224 16.7199 0.19619

35,951,105 67,193,688 92,894,800 141,542,690

483,313,340

886,108,900 1,782,742,060 [2,788,764,300 Orbital Velocity Miles Per Second.

29.55

22.61

18.38

15.00

8.06

5.94
4.20

3.35

LIGHT AT

Axial
Rotation.

In Miles.

10.58

1.94

1.03

0.52

0.041

0.012

0.003

0.001

Astronomical Phenomena for the Year 1915.

ASTRONOMICAL SIGNS AND SYMBOLS.

Perihelion. Aphelion.

H. M. S.
7 48 0
24 5?
23 21 ?
23 56 4.09
24 37 23

9 55 20
10 14 24
Unknown.
Unknown.

4.59

1.91

0.97

0.36

0.034

0.010

0.0025 0.001

Gravity at Surface. · - 1

27.6057
*.37979
.85236
1.00000

32222 2.57115 1.10175 .98932

86338

Conjunction.
Quadrature.
Opposition.
Ascending Node.
Descending Node.

64

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. By 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 itsascending" (2) or "descending" () node it is crossing the plane of the earth's orbit. The term Perihelion " means nearest, and Aphelion' furthest, from the sun. An occultation" of a planet or star is an eclipse of It by some other body, usually the moon.

**

56

I.-ECLIPSES.

In the year 1915 there will be only two eclipses and both of the sun, as follows: 1. An annular eclipse of the sun February 13-14 invisible in America. The path of the annulus lies in the Indian and Pacific Oceans and the northwestern portion of Australia,

The path of the annulus lies At Honolulu 2. An annular eclipse of the sun August 10 invisible in America. wholly in the Pacific Ocean. It is visible as a partial eclipse in the Sandwich Islands. the eclipse begins at 10h, 36, 8m. A. M., ends at 1h. 53 4m. P. M., Local Mean Time.

Ján.

Astronomical Phenomena for the Year 1915.

ASTRONOMICAL PHENOMENA FOR THE YEAR 1915.-Continued.

D, H. M.

1 2 OP. M. Ó
2 7

A. M.

2 1

511
7 2
A. M.
12 6 13 A. M.

14 10 44 P. M.
15 950 P. M.
17 530 P. M.
27 12 50 P. M.
Feb. 2 2
6 1
61
10 634 A. M. O
11 11 OP. M.
12 10 57 P. M.
14 3 20 P. M.
14 7

P. M.

P. M.

14 10 7 P.M.
1811
21

A. M.

7

A. M.

P. M.

21 1
23 8
24 10
26 12

P.M.
A. M.
A.

M.

A. M.

11 8 24 P. M. 9
13

836 A. M.

14 124 A. M.

5 P. M.

A. M.

19 1 A. M. Ó
2010 A. M.

23 5 30 A. M.
23 8
29 8

P. M.

Mar. 1 2

14 12
17 4

May

P. M.

A. M. O superior.
in perihelion.

A. M.
A. M.

0000

aaaaa

адаахаа ааа

Apr. 3 9

511 10 10

P. M.

11 7 A. M.

12 456 A. M.

12 840 P. M.

15 11 A. M.

19 4 15 P. M.

29.8 A. M.

1 1 P. M.

P. M.

P. M. O

A. M.

aaao

да аааа аааааааа аааааа

II.-PLANETARY CONFIGURATIONS, 1915.

(Washington Mean Time,)

31 9 A. M.
31 4
June 5 3

P.M.

9 850 A. M.

10 10 9 A. M.

13 414 P. M.

, N. 48'.
greatest brilliancy.
in perihelion.

P. M.

N. 33'.

gr. elong. E. 180.
gr. elong. W. 470.

13 11 P. M.

14 232 A. M. Ó

19 6 Α. Μ. Π

stationary.
♂ N. 24.

♂ 8. 271.

N. 7.
S. 54'.

in perihelion
inferior.

stationary.

H, N. 10 10.

लतंतक लललल

gr. elong. W. 28°.
♂ S. 12'.

912 A. M.

11 450 A. M.
11

746 A. M.

14 8 A. M., & S. 56'.

15 918 A. M.

17 350 A. M.

in perihelion.

in aphelion.
superior.

2, N. 20 19.
elong. E. 230.

gr.

stationary.

A. M.

8 528 A. M. 910 P. M. 15 3 A. M. 16 12 46 A. M. 25 12 P. M. 9.P. M.

28 7

Dec. 6 5 8 A.M. 6

8 128 A. M.

10 12 A. M.
12 8 P. M. D

13 935 A M. 6
15 7 P. M.
22 234 P. M. 3 h
26 2

P. M.

superior.

h S. 10 8.

gr. elong. E. 260.

229 A. M. inferior,
29 632 A. M. ♂ h
29 7 P. M.
30 9 P. M.
31 11 30 A. M. Ó
Nov. 511 P. M.

75

stationary.
stationary.

gr. elong. W. 190.

stationary.

in aphelion.

superior

1