* Switch by click.

<->

(No tracking diurnal motion mode)

When time passes.....

(Sidereal time tracking mode)

When time passes.....

The horizon moves though the stars doesn't move.
Display tracking the star(sidereal time tracking).
When you simulate the solar eclipse, moon eclipse, planet, and comet, etc. , this mode is convenient.

Why is this mode necessary?
It is the same as seeing the object with the telescope to display the object zooming.
Therefore, the object comes off from the screen when time passes.
The screen scrolls to track the diurnal motion at the [SDTime] mode.