The Shariah requires us to shorten certain prayers when we are travelling (as defined) and break your fast as well.
That is because it’s a rational concept based on common sense. For every field in life you depend on the expert in that field.
This is a recommended salaah read by our Sunni brothers but in essence it is something new to Islam.
Many people should be aware by now that Shia break their fast a few minutes later than their Sunni brothers (in general) and possibly wonder what the reason for this is.
There is no dispute among Muslims that we have to pray 5 prayers in a 24 hour day.