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Measurement starts from3. Upwards is +Angle. Downwards is -Ve Angle. Below picture shall make everything very simple.
3 o clock 0 degree and 12 o clock 90 degree
start +Angle
downwards is - ve
ACAD can start from any direction for starts measuring an angles (O clock , Counter o clock ) from left to right and vise verse .
3 o'clock
In AutoCAD By default, positive X, (3 o'clock) is0 degrees, Positive Y, (12 o'clock) is90, straight across negative X (9 o'clock) is180, etc..
Please read this Artical.
The Observation Editor section contains a graphical representation of the inside of the inspected section looking from the ‘from manhole’ toward the ‘to manhole’. The observation editor is further delineated by twelve wedges representing positions on a clock.
Observations in the observation editor are depicted as follows:
Observation Editor