This very cool moment happens a few times a year and it looks like the next one is 9/22. We will be on the steps, no doubt scattered about, for different perspectives/compositions.
Below is a summary of the time for sunrise and of the position of the sun when it’s hitting the center of the memorial. An angle of about 5 degrees or less is ideal.
Sunrise: 06:55 AM 88.9 Deg / -0.2 Deg
Memorial: 07:03 AM 90.0 Deg / +1.0 Deg
Sunrise: 06:56 AM 89.4 Deg / -0.2 Deg
Memorial: 07:00 AM 89.9 Deg / +0.3 Deg
Remember when parking to obey signs and if needed, make a payment at the machines or using the DC parking app. If this particular shot doesn't motivate, there are lots of sunrise opportunities, such as the Reflecting Pool, Vietnam Memorial, WWII, etc. Always remember to share your images back to the group to inspire others!