Astronomy with an Opera-glass: A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical InstrumentsServiss, Garrett Putman
Science
Astronomy with an Opera-glass: A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments
Serviss, Garrett Putman
Astronomy
In the old star-maps the Lion is represented as in the act of springing
upon his prey. His face is to the west, and the star Regulus is in his
heart. The sickle-shaped figure covers his breast and head, Gamma being
in the shoulder, Zeta in the mane of the neck, Mu and Epsilon in the
cheek, and Lambda in the jaws. The fore-paws are drawn up to the breast
and represented by the stars Zi and Omicron. Denebola is in the tuft of
the tail. The hind-legs are extended downward at full length, in the act
of springing. Starting from the star Delta in the hip, the row
consisting of Theta, Iota, Tau, and Upsilon, shows the line of the
hind-legs.
Leo had an unsavory reputation among the ancients because of his
supposed influence upon the weather. The greatest heat of summer was
felt when the sun was in this constellation:
"Most scorching is the chariot of the Sun,
And waving spikes no longer hide the furrows
When he begins to travel with the Lion."
Looking now westwardly from the Sickle of Leo, at a distance about equal
to twice the length of the Sickle, your eye will be caught by a small
silvery spot in the sky lying nearly between two rather faint stars.
This is the famous Praesepe, or Manger, in the center of the
constellation Cancer. The two stars on either side of it are called the
Aselli, or the Ass's Colts, and the imagination of the ancients pictured
them feeding from their silver manger. Turn your glass upon the Manger
and you will see that it consists of a crowd of little stars, so small
and numerous that you will probably not undertake to count them, unless
you are using a large field-glass. Galileo has left a delightful
description of his surprise and gratification when he aimed his
telescope at this curious cluster and other similar aggregations of
stars and discovered what they really were. Using his best instrument,
he was able to count thirty-six stars in the Manger. The Manger was a
famous weather-sign in olden times, and Aratus, in his "Diosemia,"
advises his readers to--
"... watch the Manger: like a little mist
Far north in Cancer's territory it floats.
Its confines are two faintly glimmering stars;
These are two asses that a manger parts,
Which suddenly, when all the sky is clear,
Sometimes quite vanishes, and the two stars
Seem to have closer moved their sundered orbs.
No feeble tempest then will soak the leas;
A murky manger with both stars
Shining unaltered is a sign of rain."
Like other old weather-saws, this probably possesses a gleam of sense,
for it is only when the atmosphere is perfectly transparent that the
Manger can be clearly seen; when the air is thick with mist, the
harbinger of coming storm, it fades from sight.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account