It is because we are crossing the international date line going in an easterly direction.
With approximately 360,000 inhabitants, Lublin is the most easterly conurbation in the EU.
Antonyms
This room has unparalleled northerly and easterly views, including some of London's most famous landmarks.
South Utsire, north-westerly five or six, veering easterly or south-easterly, four or five.