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## Homework Statement

The period of Mars is 1.881 years. When Mars is opposite the Sun in the sky, its position with respect to the background of fixed stars is measured at sunset and again at sunrise. The effective baseline between the two positions is 11,700 km and the change in position on the sky is 30.8''. Find 1 AU.

## Homework Equations

## The Attempt at a Solution

The solution provided is shown below.

To convert 30.8'' arcseconds to radians, shouldn't it be ##\frac{30.8}{60\times 60} \times \frac{\pi}{180}##?

[Edit: It appears there was a mistake in the solutions, the final answer turns out to be right.]