Use the unit circle shown here to solve the trigonometric equation. Solve over $\left[0^{\circ}, 360^{\circ}\right)$
\[
\sin \theta=-1
\]
The solution set is $\left\{\square^{\circ}\right\}$.
(Do not include the degree symbol in your answer. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.)

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$\boxed{270}$ is the final answer.

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Step 1 ：The sine function gives the y-coordinate of the point on the unit circle that is an angle of $\theta$ degrees counterclockwise from the positive x-axis.

Step 2 ：The sine function is -1 at $\theta = 270^{\circ}$.

Step 3 ：So, the solution to the equation $\sin \theta = -1$ is $\theta = 270^{\circ}$.

Step 4 ：$\boxed{270}$ is the final answer.

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