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The horizontal angle between the true meridian and magnetic meridian is known as Declination.
Since the declination is to be west, the magnetic meridian will be to the west of the true meridian.

The sun is at the Autumnal Equinox on September 21.
The Autumn Equinox is the first day of the autumn season and occurs when the sun passes the equator moving from the northern to the southern hemisphere.
The North Pole begins to tilt away from the sun.
Day and night have approximately the same length.

Subsidiary station established as near the true triangulation station as possible is known as Satellite station.
It is also known as Eccentric station or False station.

The centre of gravity of a right circular hollow cone of diameter d and height h lies at a vertical distance of h/3 from the base.

When the span of the roof exceed 5m and where there are no inside walls to support the purlins then trusses are provided at suitable intervals along the length of the beam.
Spacing is limited to 3m for wooden trusses.

In struck pointing the face of the pointing is sloping outwards.
This is a modification of flush pointing in which the face the pointing is kept inclined, with its upper edge pressed inside the face by 10mm which drains water easily.

The process of removal of formwork or shuttering in the process of casting concrete is known as striking.
Minimum period before striking formwork to slabs is 3 days.

The line joining the optical centre of object glass to the centre of eye piece of a telescope is axis of telescope

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