Tap the time button at the top to reveal time center. Use the arrow buttons to rewind or fast-forward time. Repeated taps will increase or decrease the speed. When the time rate becomes too fast Sky Guide will begin stepping by whole days. You can track objects through time by selecting them.
Tap the time reset button on the right to change back to the present time. Tap the calendar button on the left to change the date. Swipe the time controls down to hide them.
Pro Tip: Tap and hold the arrow buttons to immediately skip by whole days.