Tracking Rate for Transit of Mercury

You aren’t going to waste the ability of a GoTo capable telescope in this event, are you? Sun doesn’t “move” at the speed of stars.

The movement of the stars from east to west across the sky is caused by the rotation of the Earth. The movement rate is called sidereal rate. The movement of the Sun is slower 35% than the sidereal rate. So, you have to slower the tracking rate of your computerized mount (either an EQ mount or a fork mount).

For a Meade GoTo telescope, you have to change the tracking rate from “Sidereal” to “Custom”. The path will be Setup>Tracking Rate>Custom. As suggested by dick who is always active in modifying Autostar II firmware, the custom rate has to be adjusted to -3 FOR MOST OF THE UNITS. If your autostar controller is either StarGPS patched or dick patch kit patched, you can enter -3.5 for a more precision tracking rate.

For others, the tracking rate is suggested to altered to -3 as well. If this doesn’t work, try to find out another figure around this.

Beware of using an unfiltered telescope to point to the Sun, it will cause severe damage to both of your telescope and your eyes.

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