Two red glowing lights, moving slowly southeastward, looking from central Ann Arbor.

While biking home tonight I came to the intersection of Hill Street and South Division St., I stopped to check my phone for messages, when I looked up and noticed two red glowing lights in the sky off towards the southeastern horizon.  At first I thought they were planes, but I quickly realized that they were an unusual solid red color, unlike a plane with blinking lights.  I observed the two red lights as they slowly moved further towards the southeast until they vanished, one after the other, into the clouds.  
I could not tell at what elevation they were flying, only that they seemed to be generally at the same elevation as the planes flying nearby.  They moved markedly slower than all of the obvious planes flying nearby, and the lights kept the exact same distance from one another throughout my observation.
I took a photo using my cellphone camera which shows the two lights clearly, however it does not show the red color I observed with my eyes and there is little detail to the lights.  Notably, the airplanes that were also in the sky in the view of my camera did not show up on my camera, as I assume they were not bright enough to be captured.  Please let me know if you would like this photo.