The plane of a dip circle is set in the ...

The plane of a dip circle is set in the geographic meridian and the apparent dip is `del_(1)`. It is then set in vertical plane perpendicular to the geographic meridian. The appartent dip angle is `delta_(2)`. The declination `theta` at the plane is

`theta=tan^(-1)(tandelta_(1)tandelta_(2))`

`theta=tan^(-1)(tandelta_(1)+tandelta_(2))`

`theta=tan^(-1)((tandelta_(1))/(tandelta_(2)))`

`theta=tan^(-1)(tandelta_(1)-tandelta_(2))`

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