In a message dated 6/18/2007 2:32:02 PM Central Daylight Time,
drdale_com@... writes:

How do the guiding rates, 1.0x, 0.5x, 0.25x etc translate to motion of
the mount? What are the units?

1x means 1 times sidereal. Therefore in RA the actual guide rate would be
either zero tracking (star drifts at 1x sidereal westward) or 2x tracking (star
drifts 1x sidereal eastward). In Dec the star moves either N or S at 1x
sidereal. 1x sidereal is 15 arc sec per sec. The other rates are half and 1/4 of
that.

Rolando


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How do the guiding rates, 1.0x, 0.5x, 0.25x etc translate to motion of
the mount? What are the units?
If I am using PHD guiding and it gives a 50ms pulse and the keypad
guide rate is set at 1.0x does the motor or mount move a specific
amount? Is this translated to a certain number of steps of the servo
motor?
In the AP 900 is there a specific number of "steps" per arc minute of
RA movement?