An introduction to astronomy: designed as a text-book for the use of students in college. By Denison Olmsted ...

atntlmosphel) re, could neverl re1ach so flar fiom the sun as this llgltt
is seen to extend.: Tit has be}men t supposed by others to bes a
Ilcbullous body revot ill vin atround the sun. Froml recent ob)servat ionl, n ade \wtiht cae in various parts of tropical America,t
there lappears to be str'onlr evit'ence tlhat, the Zodiacal Itight is
a belt which entirely surrounds thl earlthllf'
O HI A P." ~PER]g II.
OF THIIE APPAII'NT ANNUAL 1MOTIO' OF TlE U S..SEASON....:-.-F.IURNE' OF TlE: ];AR'I S5 OU.I'IT.
1 5 3..,lh["l revolutioll Oif the earth around the sun once aw
yc(ar, produces an apparent, motion of the smt aroundt the carth
inl t}to sane period. ghlenl bodies te at suchl a distance from
each other as tle cartlt and telt sun, ) specta.:tor on~ eithler
Nould project the other body upon the conca\e sphere of the
heatlvens, always seeing it oil tle opposite side of a great ci'rcle,
I:80 fI'tom hintself.'I's, when the earth arrives at Libra,
(Fig. 11), vwe see the sunl in the opposite sign Ariiies. When
the earth mnovcs firom tIibra to Scorlpio, as we are unconscious
of our1 oown nmotion, the sun it is that appears to move friom
Aries to Taurns, 1being alv-ways seen in the heav2enls, whllere a,
line dIlawn firom the eye of the spctator ttlroughl the )bod(t
lieets the concave spllere of the heavens. I Ilcmee thie line of
projection carries the sun f\rwatrd on0 onel side of the eclip-tic,
at thle same rate as the earth moves oQn t}ec opposite side; andlt
therefotre, although we are unconscious of ol ow 01t. \VI otioll, we
cant iread it friom day to day in the motions of the sun. If Iwe
could see the stars at the samet time wt ith the sull, we could
actually observe from day to day tle sun's progress thlroullglh
theml, as we observe the progress of thle moon at night,; only
the sun's irate of motion wouldt be nearly fourteen times slower
thian tha{tt of the moon, Althoughlo l e 1do not see tte stiafirs
M* Mec. (Cdletste, iii., r25.' See a paper by Rev. Gco. Jones, U S. Navy. Proc. Amer. Assoc., 1859, p.
172.