The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Off on a Comet by Jules Verne:|
against the ordinary short strong waves of the Mediterranean;
the main inconvenience that was experienced was the diminution
in her proper rate of speed.
For a few miles she followed the line hitherto presumably occupied
by the coast of Algeria; but no land appeared to the south.
The changed positions of the planets rendered them of no avail
for purposes of nautical observation, nor could Lieutenant Procope
calculate his latitude and longitude by the altitude of the sun,
as his reckonings would be useless when applied to charts that had
been constructed for the old order of things; but nevertheless,
by means of the log, which gave him the rate of progress,