Part A

What is the average zenith angle given the following direct and reversed readings?

Direct: $79{45}^{\text{'}}04,{79}^{\text{@}}{45}^{\text{'}}{12}^{\text{'}\text{'}},{79}^{\text{@}}{45}^{\text{'}}08$

Reverse: $280{14}^{\text{'}}{50}^{\text{'}\text{'}},280{14}^{\text{'}}{48}^{\text{'}\text{'}},280{14}^{\text{'}}{52}^{\text{'}\text{'}}$

Express your answer in integer degrees, minutes, and seconds separated by commas.

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