a useful rule of thumb is that ra = 00h 00m 00.0s will cross the meridian for located in greenwich, england at midnight local time on september 21. for the same observer, what ra will be crossing the meridian in the following and give your answers in hh mm ss. s format. (8 points) an observer scenarios? show your work a.) 7: 00am on september 21 b.) noon on march 21 c.) 2: 00pm on december 21. d.) 3: 04am on july 4