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4 degrees west of Greenwich, England is the Prime Meridian, the line of 0 degrees longitude.
Dublin is at (Greenwich Mean Time) GMT. Cairns is (Greenwich Mean Time) GMT +10 hours, ie. 10 hours ahead of Greenwich, England. Dublin is 10 hours behind Cairns. (Daylight savings not taken into account.)
Greenwich 0 degrees is called the Prime Meridian. It is the line of 0 degrees longitude from which all other longitudes are measured.
If it is 12 noon at Greenwich (0 degrees longitude), then every 15 degrees of longitude corresponds to a one-hour time difference. Therefore, if you are 30 degrees east of Greenwich, the time would be 2:00 PM.
zero degrees, the Prime Meridian