A very handy tip for those who don't want to be blinded by a page of notes while looking at stars:

iPad / Phone full red mode:

put your ipad or iphone into red mode easily …

To enable this: Settings->Accessibility->Display and Text Size->Color filters (enable) [more specifics] … (enable Filter Shortcut)

Now press the home button 3 times fast.

Red screen overlay mocked up in Acorn as the iPhone screenshot didn't show it.
Red screen overlay mocked up in Acorn as the iPhone screenshot didn't show it.