Editing 2463: Astrophotography
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* The photograph must be taken during a partial solar eclipse. These only happen a few times per year and are only visible in part of the world. | * The photograph must be taken during a partial solar eclipse. These only happen a few times per year and are only visible in part of the world. | ||
* The photographer must be quite far away with a telephoto lens to achieve the visual scale. A nearby person appears larger than the moon. It is possible to photograph the silhouette of a person or a cityscape in front of a full moon, making the moon look comparatively larger or smaller by adjusting the distance to the closer subject, and then the lenses used by the photographer to make them both fill just the right amount of the frame. | * The photographer must be quite far away with a telephoto lens to achieve the visual scale. A nearby person appears larger than the moon. It is possible to photograph the silhouette of a person or a cityscape in front of a full moon, making the moon look comparatively larger or smaller by adjusting the distance to the closer subject, and then the lenses used by the photographer to make them both fill just the right amount of the frame. | ||
β | ** The photographer would need to be approximately one kilometer distant if the image is a typical human scale. | + | ** The photographer would need to be approximately one kilometer distant if the image is a typical human scale. The moon has a visual angle of about 0.5 degrees. The characters are approximately 1/5 the moon's height giving a 0.1 degree viewing angle. A right triangle with a height of 1.7 meters (a typical human height) spanning 0.1 degrees for the side angle, the distance would be 974 meters (3195 feet) from Cueball and Megan. |
β | |||
* The exposure time of the photograph had to be short enough to capture clear silhouettes of the ISS, the juggling balls and the arrow while these were in the air. | * The exposure time of the photograph had to be short enough to capture clear silhouettes of the ISS, the juggling balls and the arrow while these were in the air. | ||
* The mountain had to be in a location that would happen to see the ISS passing in front of the sun at the same time as the sun was rising from behind it. | * The mountain had to be in a location that would happen to see the ISS passing in front of the sun at the same time as the sun was rising from behind it. |