Y

"Year of Stars," the, 377

Yerkes Observatory, Chicago, 16

Young, Professor, account of a marvellous Sun-prominence, 42;
and Sun-spots, 38;
observations on magnetic storms, 39

Z

Zeeman, Dr., and spectral lines, 491

Zinc in the Sun, 50

Zodiac, the, 5

Zodiacal light, 67

Zone of minor planets, 234

PRINTED BY CASSELL & COMPANY, LIMITED, LA BELLE SAUVAGE, LONDON, E.C.

FOOTNOTES:

[1] It may, however, be remarked that a star is never _seen_ to set, as,
owing to our atmosphere, it ceases to be visible before it reaches the
horizon.

[2] "Popular Astronomy," p. 66.

[3] _Limb_ is the word used by astronomers to denote the _edge_ or
circumference of the apparent disc of a heavenly body.

[4] "The Sun," p. 119.

[5] It has been frequently stated that the outburst in 1859, witnessed
by Carrington and Hodgson, was immediately followed by an unusually
intense magnetic storm, but the records at Kew and Greenwich show that
the magnetic disturbances on that day were of a very trivial character.

[6] Some ungainly critic has observed that the poet himself seems to
have felt a doubt on the matter, because he has supplemented the dubious
moonbeams by the "lantern dimly burning." The more generous, if somewhat
a sanguine remark has been also made, that "the time will come when the
evidence of this poem will prevail over any astronomical calculations."

[7] This sketch has been copied by permission from the very beautiful
view in Messrs. Nasmyth and Carpenter's book, of which it forms Plate
XI. So have also the other illustrations of lunar scenery in Plates
VIII., IX. The photographs were obtained by Mr. Nasmyth from models
carefully constructed from his drawings to illustrate the features on
the moon. During the last twenty years photography has completely
superseded drawing by eye in the delineation of lunar objects. Long
series of magnificent photographs of lunar scenery have been published
by the Paris and Lick Observatories.

[8] At the British Association's meeting at Cardiff in 1892, Prof.
Copeland exhibited a model of the moon, on which the appearance of the
streaks near full moon was perfectly shown by means of small spheres of
transparent glass attached to the surface.

[9] The duration of an occultation, or, in other words, the length of
time during which the moon hides the star, would be slightly shorter
than the computed time, if the moon had an atmosphere capable of
sensibly r