Sérgio Garcia Doret wrote: > > Can you help me? > I buildt a horizontal sundial, with correction for longitude. I want > install it with no prior determination of true north. > At noon, when the sun is at the zenit, on the local meridian, I will point > the gnomom to true north (i'm at the southern hemisphere), just looking for > a point where the shadow cast exactly on the noon hour line. That's correct? > Supose I will install it on August 15, when the sun is 4 minutes 33 seconds > late with the local mean time. I ask: the exact moment to that is at local > mean time MINUS orPLUS 4 minutes 33 seconds? > > Thank you in advance > > Sergio Doret
Sergio, Because the sun is 'late' on august 15 your watch still has to run some minutes before the sun shows the 'right' time. In this case add the 4 min and 33 sec. Fer de Vries, Netherlands.
