no RROWX : 



We have seen that dh the ist vScpteinber al Media mean 

 noon the sun is on the meridian and the shadow of the style 

 covers the XII mark. 



But the watch says one minute and a half after mean noon, 

 which is standard time, the time of a place to eastward of us. 



Now after Sep. ist the sun is gaining, and on the meri- 

 dian before the mean sun ; in fact more and more every day ; 

 and there will be a time when the true sun will be on the 

 meridian 92 seconds before the mean sun ; that is to say on 

 the meridian by standard noon (nearly;. This takes place 

 between the 5th and 6th of September. On the 6th of Sep- 

 tember, therefore, dial and standard watch will be together, 

 nearly but not exactly, at noon. 



From this on until Nov. 3rd the sun is more and more 

 ahead of mean solar time. After that date he is less and less 

 ahead of mean solar. So there comes a time when he is 92 

 seconds ahead of mean solar. But 92 seconds ahead of mean 

 solar is standard and on that day standard watches will agree 

 (nearly but not exactly) with the sundial at noon. The day 

 is between the noons of 21st and 22nd December. The Nau- 

 tical Almanac enables us to fix the hour and minute. Then 

 comes Zero Day, 24th Dec. and the sun is on the meridian at 

 92 seconds past noon by standard time. 



The sun now begins to fall behind mean solar and does so 

 more and more until Feb. i ith when he begins to overtake it ; 

 and does so overtake it on the 15th April, Zero Day. At this 

 point again the sun begins to outstrip mean time more and 

 more, until he have done so by the space of 92 seconds. But 

 92 seconds ahead of mean time of Media is standard time. 

 Sun therefore agrees with watch at some period between the 

 noons of 22nd and 23rd April. 



Nautical Almanac for details. 



From 15th April on, the sun is ahead and more and more 

 ahead until May 14, when he begins to fall behind, and about 

 June 7 is no more and no less than 92 seconds ahead of mean 

 time. But 92 seconds ahead of Media mean time is Standard 



