सिद्धान्तदर्पण (महामहोपाध्याय सामन्त चन्द्रशेखर सिंह - नग्न-नेत्र खगोल वेध एवं गणित महाकोश)

Introduction lxiii
yojanas for the true diameter of the Sun, the
distance of the Sun from the earth was found to be
between 105 and 106 times the Sun's diameter. In
other words, the distance of the Sun and the Moon
are 9510 and 61 radii of the earth respectively
(VIII.12, 13, & XIX.49).
The introduction is brought to a close with
another topic well-known even to the boys of our
elementary schools. It is about the movement of the
earth, which Chandrasekhara does not admit. It is
curious no doubt to hear a man given to astronomy,
maintaining with all seriousness an idea which
mankind has learnt to repudiate since the days of
Copernicus. And there are men who, talking glibly
of the earth's movements, thought that his
calculations could not possibly come out right from
such wrong fundamental premises. It is needless to
argue the matter with those whose rudimentary
knoweldge of mathematics did not enable them to
understand relative motion and I would not have
introduced the topic, had it not been made the sole
criterion of the merits of this work.
To such critics, I would suggest that centuries
elapsed during which our forefathers and the
forefathers of Europeans did nto even dream of the
possibility of this firm and fixed earth's spinnign
Sun's horizontal parallax to be aobut 8" and that of the
Moon 56'40". But he has found no reasons for correcting
his figures. He says, the difference between the parallaxes
of the Sun and the Moon amounts to 56'32" according to
European astronomy, while he finds 56'6" giving results
agreeing with observation. Now, if the difference were
changed by 26", an annular eclipse would be changed in
to a partial, a partial into an annular and a total into a
"touching" one.