SUNDAY 5/15. The Sky. 10:29-11:53 p.m. Free. 

The total lunar eclipse in mid-May is what they call a “Blood Moon,” since the moon turns a reddish hue when it moves into the Earth’s shadow. Wild, right? It’s because even when the Earth is completely keeping the Moon from reflecting any sunlight into our view, Earth’s atmosphere refracts light and scatters certain wavelengths of color while letting others pass — namely, the red and orange bits of light. You can see this one without any special equipment; just look for the Moon in the late evening of May 15 beginning at around 8:32 p.m., with the peak of the eclipse landing at around 11:11 p.m.