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The third year students were set to continue their practice of mapping the skies tonight. They were heading to a Northern Hemisphere location to chart the constellations discussed the previous week. Each desk had a blank star map waiting for them. As voices approached from the stairs, Professor Percival Zephyrmoon opened the door, closing it after the last student entered. He let them settle in and examine their maps.
"So glad tonight is such a clear night," Percival began, pausing to see if any students would catch on. Outside the windows, rain and lightning raged. "Of course, I mean at the location we're headed to. That's right - another field trip! The weather report from my trip there earlier shows clear, dark skies, perfect for stargazing." He pulled out an old, coffee-stained cushion, and had the students gather around, each placing a hand on the fabric before they disappeared from the castle, reappearing in an open field.
After adjusting his footing, Percival began, "We are in the Northern Hemisphere and technically yesterday morning! Here in our past, we shall see stars," he said, pointing up. It was much later here than back at the castle. "You have an hour and a half to map as many constellations as we discussed last week - the ones visible in the northern hemisphere. If you finish early, feel free to map any other constellations you spot. Use your tools properly to get accurate distances between the stars. These maps will be graded, so accuracy is key."
The students began their measurements, and Percival kept a watchful eye on them. At the end of their lesson, he gathered everyone around the portkey. "Remember, the semester is almost over. Don't do anything stupid like wait until the night before your exam to study!" he called out as they returned to the castle..
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For full credit, RP the lesson.