Its all about point of reference. When I worked with radar we liked GPS time, always increasing so its easy to get a difference. But for locating the sun and

Its all about point of reference. When I worked with radar we liked GPS time, always increasing so its easy to get a difference. But for locating the sun and sun rise, earth time is useful (those griping astronomers have a point). We figured it out, and it wasn't too bad. Some good time libraries would go a long way...