BEIJING (AP): The brightest moon in almost 69 years is lighting up the sky in a treat for star watchers around the globe.

The phenomenon known as the supermoon reached its peak luminescence in North America before dawn on Monday. Its zenith in Asia and the South Pacific was Monday night. Across the international dateline in New Zealand, it was to reach its brightest after midnight Tuesday local time.

The moon orbits the Earth in an oval shape. The moon will be at its brightest this week because it is coming closer to the Earth along its elliptical orbit than at any time since January 1948. The supermoon will also bring stronger than usual high tides, followed by plunging low tides the next morning.

Viewers can expect to see a moon about 14 percent larger in diameter and about 30 percent brighter than when it’s at its furthest distance from the earth. It won’t be as big and bright again for another 18 years.