# How do you calculate declination?

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## How do you calculate declination?

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

## How to find magnetic declination?

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

Should I add or subtract magnetic declination?

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

### What is the line of declination?

When the two poles align, the declination is zero, and the line of zero declination is called 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 Chart?

The bottom line is this – a declination chart is a graphic intended to show map readers the relative relationships between grid, sand and magnetic north. As such, it may 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 the true reading (west is best, and therefore a larger number), and for east declination, subtract the true reading (east is least, and therefore a smaller number).

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

During an equinox, on March 21 or September 22, the sun's declination (hereafter referred to as declination) is 0º.

What is the sun's declination on June 21st?

23.5 oN
Latitudes in the Northern Hemisphere show their longest daylight at the summer solstice (June), while the Southern Hemisphere shows its longest daylight at the winter solstice (December). Having the sun directly overhead can only happen between the Tropics of Cancer and Capricorn. Sunset on June 21: 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 southern edge of the estuary of the Yangtze in the middle part of the eastern China coast. The municipality borders the provinces of Jiangsu and Zhejiang to the south, east and west, and is bounded by the East China Sea to the east.

## When was the western part of Shanghai inhabited?

The western part of modern Shanghai was inhabited 6000 years ago. During the Spring and Autumn Period (c. 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 several 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 on USGS topographic maps shows the magnetic declination at the center of the map in the year the map was made.

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