Most of these are pretty easy but the Settings button opens up a world of secondary options so I’ll skip it till after we’ve looked at the other buttons:
Standby – This puts the Sky Mark into a minimized standby mode. Hard to take pretty pictures when the HUD is obscuring a hunk of your screen 🙂
Sunrise, Midday, Sunset, and Midnight – quickly switch to the specified standard SL sky. The same as pressing Shift Control Y, N, X, and… Ummm… I’m not sure what the keyboard shortcut for Sunrise is, but that.
Default – Switches you to the current default sky setting.
Next up I start to get really wordy with the Settings Menu.