To the Editor of the a Datty> News, Will yon allow me space in jumble paper for the following trust, some of your readers will oblige by answering with explanations If aw perfect time-keeping clock requiring winding once in three months only ix wound up on, say, September 22 Shanghai indicating the—hour twelve" at nou at sunset, what, will the clock show at the nil of the three months with regard to sunrise, noon, and sunset Thus putting the questions serial-
YG) Doce sunrise vary by the clock time (2) Does noon vary by the clock time (3) Does sunset vary by the clock me (4) Assuming the answer to the 2nd question is in the negative, does the distance in time between sunrise and noon differ from that between noon and sunset the answer to the 2nd does the distance in ti in the negative, between noon and sunset vary Thanking yon anticipation, Ewquinen, September 12.
There is one initial difficulty which seems to have escaped our cor respondent's attention. On September 22, the sun rises at 5.49 a.m, and sets: at 5.56 pan. The perfect time-keeping clock would, therefore, have to cover 12 hrs, and 7 in its 12 hrs. run. Tt might do so; but could hardly then be called a perfect time-keeper.—Ep.
To the Editor of the "Nonrn Cua Daly News.
Sin,—To the first three questions asked by "Inquirer" in your issue of Saturday last, the answer is " Yes," which disposes of the two following questions also.
The subject of time is rather complicated, as there are three quite distinct times used by Astronomers and Navi.
Text read from the printed page and cleaned; old type leaves the occasional error.