People can fall: â  from the edge of a completed roof; â  from the edge where work is being carried out; or â  through openings or gaps. Edge protection Unless the roof parapet provides equivalent safety, temporary edge protection will be required during most work on flat roofs.
Why is astronomy considered the original science? Astronomy is the oldest science for our ancients either drew or made structures according to seasons or movements of celestial bodies in our Universe.
Difference between astrology and astronomy in the simplest form is this; astronomy is a science while astrology is considered a pseudo-science by modern scientists. However, we can all accept that astronomy and astrology are similar looking words that are also somewhat related.