Thonky.com's The Legend of Zelda: Tears of the Kingdom Guide

Starview Island is in North Gerudo Sky Archipelago and is home to Mayasiar Shrine.

Location of Starview Island

Starview Island is located at -3545, -0320, 1965 in the North Gerudo Sky Archipelago. To reach it, launch yourself at Gerudo Highlands Skyview Tower and go northeast to an island with a round pool of water on it. Defeat one of the Constructs on a floating Zonai platform, then attach ONE rocket so it is angled up toward the large orb-shaped island. Leave another rocket secured but not attached against one of the statue heads on the side of the Zonai platform. Hit the rocket or platform to launch it. When the first rocket disappears, attach the second one at an angle pointing at the orb-shaped island, and hit it to launch it. Use the Paraglider to float onto Starview Island, then go to the northeast side and fall into the hole.

How to Reveal the Shrine

Go to the middle platform and rotate the mirror so the mirror itself is pointing toward the large glowing gem-shaped item in the west side of the island. Then look for the mirror that was lit up by the beam that comes out of the side of the area where you spun the first mirror. Follow that beam of light to the next mirror, and rotate it so it shines into the next mirror, and so on. If you have all the mirrors pointing in the correct directions, the middle mirror will light up and shine on the gem-shaped item. This reveals Mayasiar Shrine

How to Open the Bars

There is a room in the northeast part of the island that is closed with bars. The eastern mirror can point to the gem in front of the bars, so rotate the mirrors like before to make the light shine on that gem. The chest contains a Sage's Will.