How to find M21 using Sagittarius

This guide uses bright stars first, then narrows the field for a telescope or binocular finder. Use Sagittarius as the main sky landmark.

Follow the route from one recognizable star to the next until you reach M21.

M21 is 25° above the horizon toward the southwest.

Begin with Sagittarius, then follow the reference stars toward M21.

Sagittarius

Recognize the characteristic star pattern of Sagittarius before following the route.

Identify Nunki in or near Sagittarius; the chart shows its position relative to the guide.

From Nunki, move about 6.2° toward the west until you reach Kaus Borealis.

From Kaus Borealis, move about 4.1° toward the northwest until you reach HYG 89153.0.

From HYG 89153.0, move about 2.1° toward the northwest until you reach M21. This is the target field.