EOS P96 - i) Examples of offsets

Doc:
Issue
Date
Page
VLT-MAN-ESO-14650-4942
P96
24.06.2015
119 of 161
ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
i) Examples of offsets
As indicated a positive offset in the x or y direction will move the object in direction of +x and +y axis.
The first example with PA=0 degree shows the results of a positive offset in +x. The
object/star moves in the direction of the +x axis and the slit moves in the –x axis. The x,y axis
are attached to the slit.
The second offset with PA= +45 degrees shows a positive offset in y axis. The Moon
goes to the upper right corner (movement in +y axis), while the slit moves in the lower left
corner (reverse movement in the –y axis).
N
E
X
Y
N
E
X
Y
+x offset
+ y offset
N
E
X
Y
N
E
X
Y