New-York tribune., 1876-12-02
EAcrS AB0UT TIE SUN

LECTURE BY PROF. c. \. YOUNG or DARTMOUTH
COLLEGE AT ASSOCIATION HALL
Prof. c. A. Young lectured last evening at
Association Hall upon "The sun" This was the nth
lecture Of the Winter OF the Young Mems Chris
tian Association and, usual 1t was well attended
The subject illustrated with the magic lantern by
which Photographic views of the were thrown upon
a screen The professor said that the reason why he
made choice OF the sun his subject because he had
given more time 10 the study it than to that OF any other
heavenly body. Hewould to give in clear manner the
conclusions ne had arrived at and the evidence upon
which they were based No elaborate introduction was
necessary as the subject in which all classes OF
people arc Interested and wth which they move or
less familiar The SUMS light and heat form 'he motive
principle OF everything The turning OF Waer'wLeels
y the running streams ana the moving OF ships by the
power Of the wind arc directly traceahe 10 the suns
sgency To appreciate the magnitude and power OF the
sam the first thing that necessary is to make ourselves
familiar with us great distance from u.s. which Is es
mated at 80 5000 miles more than $500 times the
earth's circumference. Prof Young alluded . nc Oh
servatOus that made during the transit OF Venus
hy which this distance had been so accurately measured
and paid the observers a high compliment for their skill
and diligence. The diameter OF the sun Is 100000 miles,
or 1887 times The diameter OF the earth.
II the heat OF the Occasioned by any burning
material that could be consumed coal for instance II
would require hrecquarters OF ton every hour upon
every square foot Of surface 10 keep mp s present heat
The temperature OF the sun ls dncNt matter 10 ucteI
mine The surface of the sun il continually varying and
ss the difference between the greatest attitudes and de-
nressons amounts often 10 10000 $1,000 miles, the
temperature changes the center is approached
or recedcd from. The only thing That can
be done IL 20 get at an approximate esu-
mate OF the mean temperature. Photography
has proved Invaluable IA the study OF the sun. III mas
stepped in and settled disputes about very important
questions and settled them too, beyond doubt Photo
graphs o. the taken by attaching camera 70
telescope BY such pictures the afterward be
sded at ones leisure and iutO such pictures the ind
Nduait OF any person IN no way enter and his
ideas cannot warp mar IL. d.. Draper and one o.
two others are the most thorough photographers in the
world and New-York should be proud that in 10 other
city has the art been carried tU such perfection.
The sun turns upon its axis IS the earth docs but one
remarkable fact proves that it is rot solid body The
central portion Of the corresponding TO our equao
nal region moSs much faster than the portion winch
corresponds 70 temperate zone, the difference Deins
shout ore terrestrial day in 25 Views OF the suns spots
verc shown and explained SLOWING LO' these spots flse
and fall come and gc and change their pos mons oolt
Of them are 100 OOO miles in diameter one soe OF the
un is almost clear spots but the other side Is greatly