IOAA 2017, Наблюдения, дневен тур — Задача 5. Find True North from Moon shadow

Observational Examination (Day)

Указания
  1. Do not open the exam envelop yourself.
  2. This part of the exam consists of 7* problems located in separate exam stations.
  3. You have 5 minutes to complete each problem.
  4. After “out of time” is signaled, stop all actions and remain at the same station.
  5. After “next station” is signaled, proceed to the next exam station and hand the exam envelope to the station’s proctor.
  6. Use only blue pen to mark into the answer sheets provided. Any answers written in the answer sheet at the end of timer is considered final and will be graded towards the final score.

* Number of problems will be reduced to 5 if night observation was successful

Условие

Instruction: Draw an arrow pointing North in the data sheet

Photograph of a thin black vertical pole labelled “Pole” standing on a white surface, lit from the upper right; its long shadow runs to the lower left and ends on one of several small red cross marks on the ground.

Included:

  • Simulated position of moon shadows of a pole at certain intervals in the span of a day.
  • The observer is located in the Southern hemisphere at latitude 27°S.
  • The moon’s declination that night is +15°
  • Ruler, Compass (drawing tool), Geometry kit
Data sheet: a grey circle labelled “Pole” near the upper left and a series of small cross marks (shadow-tip positions) running diagonally from the upper left toward the lower right, the last one far to the right.
Data sheet

Решение

Внимание: Непълно решение

В архива няма официално решение на тази задача.

Оригинал в Архива: Observation_Day.pdf