Read More
Date: 18-7-2020
1836
Date: 31-8-2020
1797
Date: 26-5-2016
1715
|
The Sun as a position finder: Simple determination of latitude
Set up a simple sharp vertical gnomon to cast a shadow on to a horizontal plane having a surface on which the shadow tip can be marked. At intervals of about ten minutes, over a period of about one hour either side of the local noon, mark the position of the shadow tip. After the recordings are completed, measure the minimum shadow length from the base of the gnomon to the shadow tip. This corresponds to the time when the Sun is on the meridian. Knowing the height of the gnomon above the horizontal plane allows the maximum altitude to be determined using the formula
.
Knowing also the Sun’s declination for that day, the latitude of the observer may be determined from
Figure 1. The simple determination of latitude.
|
|
تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
|
|
|
|
|
أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
|
|
|
|
|
قسم شؤون المعارف ينظم دورة عن آليات عمل الفهارس الفنية للموسوعات والكتب لملاكاته
|
|
|