The streets around Library Park are closed to cars and parking for this weekend's Monrovia Days celebration, and there will be activities and booths in the park and on the adjacent streets around our Myrtle and Lime Street sidewalk astronomy corner. We'll reschedule Sidewalk Astronomy for next Saturday night, May 21 and share the light from the full moon, and Jupiter with you next week instead. To find out more about tonight's moon, here's a nice writeup about understanding the first quarter moon. Sidewalk astronomers typically pick the Saturday nearest the first quarter moon for their events. http://earthsky.org/moon-phases/first-quarter See you next weekend, and we are trying to reschedule the Mojave National Preserve star party, and we'll let you know when the date is finalized. -- Jane Houston Jones @jhjones What's Up May 2016: Mercury transit, Mars closest approach https://youtu.be/TQ-qbykREXE