I feel unfortunate this emblem does not apply to December 8th as a whole. The Prometheus Lens flooding crucible was active during this whole day and everyone was using it. I know because i played after midnight into the AM of the 8th just not into the observed period. Why reward only a hyper specific window that doesn't fairly treat all players who experienced the very intent of the emblem in the same regard?
It was based around when Xur offered it to everyone.