ind that its
right ascension differs by less than an hour, one way or the other, from
that of the planet sought, it is useless to look for the latter. If the
planet is situated west of the sun--to the right on the chart--then it
is to be looked for in the east before sunrise. But if it is east of the
sun--to the left on the chart--then you must seek it in the west after
sunset.

For instance, I look for the planet Mercury on October 12, 1901. I find
its R.A. to be 14 h. 40 m. and its Dec. 18 deg. 36 min. Looking at the
sun's place for October 12th, I find it to be R.A. 13 h. 8 m. and Dec.
7 deg. 14 min. Placing them both on Chart No. 4, I discover that Mercury
is well to the east, or left hand of the sun, and will consequently be
visible in the western sky after sundown.

Additional guidance will be found by noting the following facts about
the charts:

The meridian (the north and south line) runs through the middle of Chart
No. 1 between 11 and 12 o'clock P.M. on November 1st, between 9 and 10
o'clock P.M. on December 1st, and between 7 and 8 o'clock P.M. on
January 1st.

The meridian runs through the middle of Chart No. 2 between 11 and 12
o'clock P.M. on January 1st, between 9 and 10 o'clock P.M. on February
1st, and between 7 and 8 o'clock P.M. on March 1st.

The meridian runs through the middle of Chart No. 3 between 11 and 12
o'clock P.M. on March 1st, between 9 and 10 o'clock P.M. on April 1st,
and between 7 and 8 o'clock P.M. on May 1st.

The meridian runs through the middle of Chart No. 4 between 11 and 12
o'clock P.M. on May 1st, between 9 and 10 o'clock P.M. on June 1st, and
between 7 and 8 o'clock P.M. on July 1st.

The meridian runs through the middle of Chart No. 5 between 11 and 12
o'clock P.M. on July 1st, between 9 and 10 o'clock P.M. on August 1st,
and between 7 and 8 o'clock P.M. on September 1st.

The meridian runs through the middle of Chart No. 6 between 11 and 12
o'clock P.M. on September 1st, between 9 and 10 o'clock P.M. on October
1st, and between 7 and 8 o'clock P.M. on November 1st.

Note well, also, these particulars about the charts: Chart No. 1
includes the first four hours of right ascension, from 0 h. to 4 h.
inclusive; Chart No. 2 includes 4 h. to 8 h.; Chart No. 3, 8 h. to 12
h.; Chart No. 4, 12 h. to 16 h.; Chart No. 5, 16 h. to 20 h.; and Chart
No. 6, 20 h. to 24 h., which completes the circuit. In the first three
charts the line of 0 deg., or the equator, is found near th