The Subsolar Point Calculator is a valuable tool used in astronomy and geography to determine the exact location on Earth where the sun is directly overhead at a specific moment in time. This calculation is essential for various applications, including understanding solar energy distribution, navigation, and climate modeling. By inputting the solar declination angle and the noon solar hour angle, the calculator can accurately pinpoint the latitude and longitude of the subsolar point on Earth’s surface.
Formula of Subsolar Point Calculator
The Subsolar Point Calculator utilizes the following formulas to calculate the latitude and longitude of the subsolar point:
- Subsolar Latitude: Arcsin(sin(Declination)×sin(Noon Solar Hour Angle))
- Subsolar Longitude: Noon Solar Declination−Noon Solar Hour Angle
Where:
- Declination: The solar declination angle
- Noon Solar Hour Angle: The angle between the subsolar point and the observer’s meridian at solar noon
- Subsolar Latitude: The latitude of the subsolar point
- Subsolar Longitude: The longitude of the subsolar point
General Terms Table
| Term | Definition |
|---|---|
| Solar Declination Angle | The angle between the rays of the sun and the plane of the Earth’s equator. |
| Noon Solar Hour Angle | The angle between the subsolar point and the observer’s meridian at solar noon. |
| Subsolar Latitude | The latitude at which the sun is directly overhead at a given moment. |
| Subsolar Longitude | The longitude at which the sun is directly overhead at a given moment. |
Example of Subsolar Point Calculator
Suppose the solar declination angle is 23.45∘23.45∘ and the noon solar hour angle is 45∘45∘. Using the Subsolar Calculator, we can determine the following:
- Subsolar Latitude: Arcsin(sin(23.45∘)×sin(45∘))
- Subsolar Longitude: 23.45∘−45∘
Most Common FAQs
The subsolar point marks the location on Earth’s surface where the sun is directly overhead at a specific moment. It helps determine the intensity of solar radiation and plays a crucial role in climate patterns and solar energy applications.
The calculator utilizes the solar declination angle and the noon solar hour angle to calculate the latitude and longitude of the subsolar point. These values are essential for various scientific and practical applications, including navigation and renewable energy planning.
Yes, the subsolar point continuously moves due to the Earth’s rotation and its axial tilt. It shifts between the Tropic of Cancer and the Tropic of Capricorn throughout the year, following the tilt of the Earth’s axis and the position of the sun.
