How do you calculate declination?

Multiply it by -23.44, the tilt of the Earth’s axis in degrees. The result is the solar declination in degrees for that day of the year. From the example, the cosine of 53.2603 is 0.5982; multiply it by -23.44 to get -14.02 degrees.

How do you find magnetic declination?

The magnetic declination at any particular place can be measured directly by reference to the celestial poles—the points in the heavens around which the stars appear to revolve, which mark the direction of true north and true south. The instrument used to perform this measurement is known as a declinometer.

Do I add or subtract magnetic declination?

Whenever you transfer a magnetic bearing taken in the field to your map, you add the magnetic declination to get the true bearing. Whenever you transfer a bearing taken from your map to the field, you subtract the magnetic declination to get the magnetic bearing to follow.

What is the line of declination?

When the two poles align, declination is zero, and the line of zero declination is termed the agonic line. At points west of the agonic line, a magnetic needle will point east of true north (positive declination). At points east of the agonic line, a magnetic needle will point west of true north (negative declination).

What is a declination diagram?

The bottom line is this – a declination diagram is a graphic that is meant to show the map readers the relative relationships between grid, true and magnetic north. As such, it can be approximate.

How do you add or subtract declination?

An easy way to remember whether to add or subtract is “West is best and East is least.” So for West declination, add to the true reading (West is best, and therefore a larger number) and for East declination subtract from the true reading (East is least, and therefore a smaller number).

What does negative declination mean?

The direction in which the compass needle points is known as Magnetic North, and the angle between Magnetic North and the True North direction is called magnetic declination or variation. Because the angle to magnetic north is less than true north (360°), this is a negative declination.

What is the declination of the Sun on March 21?

During an equinox, March 21 or September 22, the solar declination (referred to as declination from here on) is 0º.

What is the declination of the Sun on June 21st?

23.5 o N
Northern Hemisphere latitudes show their longest daylight at summer (June) solstice, while the Southern Hemisphere shows its longest daylight in winter (December) solstice. Having the sun directly overhead can happen only between the Cancer and Capricorn tropics. Solar Declination on June 21st: 23.5 o N.

Where is Shanghai located on the east coast of China?

Shanghai. Located in the Yangtze River Delta, it sits on the south edge of the estuary of the Yangtze in the middle portion of the Eastern China coast. The municipality borders the provinces of Jiangsu and Zhejiang to the south, east and west, and is bound to the east by the East China Sea.

When was the western part of Shanghai inhabited?

The western part of modern-day Shanghai was inhabited 6000 years ago. During the Spring and Autumn period (approximately 771 to 476 BC), it belonged to the Kingdom of Wu, which was conquered by the Kingdom of Yue, which in turn was conquered by the Kingdom of Chu.

What makes Shanghai an important city in China?

Shanghai is also known for its sugary cuisine, distinctive local language and vibrant international flair. As an important international city, Shanghai hosts numerous national and international events every year, such as Shanghai Fashion Week, the Chinese Grand Prix and ChinaJoy.

Where is the declination on a topographic map?

It might surprise you to know that at very high latitudes, the compass can even point south! The collar of USGS topographic maps shows the magnetic declination at the center of the map the year that the map was made.