Pinhole Camera -Touch the Sun.pdf - All the Sun through the...

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Solar-B Education and Public Outreach (EPO) Solar-B is a multinational solar observatory satellite project headed by the Japanese Space Agency (ISAS), in partnership with the United States (NASA) and the United Kingdom (PPARC). The Solar-B EPO program at Chabot Space & Science Center is funded by a grant from the Lockheed-Martin Solar and Astrophysics Lab (LMSAL) in Palo Alto, California. The activities and materials in this package were developed for the Touch the Sun teacher-training workshop at Chabot Space & Science Center, 10000 Skyline Blvd., Oakland, California 94619. ? 2001, Chabot Space & Science Center. All the Sun through the eye of a pinhole
SOLAR-B PINHOLE CAMERA Solar-B Touch the Sun , Chabot Space & Science Center 2 Pinhole Camera Nuts and Bolts What Students Will Do Build a specialized, Sun-measuring pinhole camera . Safely observe the Sun with the pinhole camera and record image size measurements. Calculate the diameter of the Sun from your measurements and a known distance to the Sun. Key Concepts Light rays tend to travel in straight lines. Light rays emitted or reflected by an object that pass through a small hole can project an image of the object on the other side. An image of an object can be used to determine the object’s size or the distance to the object. The ability of the human eye’s lens to focus an image on the retina is aided by the eye’s pupil (the eye’s aperture), which acts as a pinhole camera. Materials Needed (per working group) Cardboard tube (the longer the better) Cardboard tube scraps Aluminum foil A sharp pin Tape Graph paper (with millimeter grid)
SOLAR-B PINHOLE CAMERA Solar-B Touch the Sun , Chabot Space & Science Center 3 Pinhole Camera Contents NUTS AND BOLTS ......................................................................................... 2 W HAT S TUDENTS W ILL D O ............................................................................. 2 K EY C ONCEPTS ................................................................................................. 2 M ATERIALS N EEDED ( PER WORKING GROUP ) .................................................. 2 INTRODUCTION ............................................................................................ 4 D ESCRIPTION .................................................................................................... 4 S OLAR -B C ONNECTION .................................................................................... 5 BUILD IT .......................................................................................................... 6 S TEP - BY -S TEP ................................................................................................... 6 OBSERVE ......................................................................................................... 7 O BSERVING S TEPS ............................................................................................ 7 D ATA S HEET ..................................................................................................... 9 LESSONS LEARNED/QUESTIONS/NEW IDEAS ................................. 11 LESSONS LEARNED/QUESTIONS/NEW IDEAS ................................. 11 ADDITIONAL ACTIVITIES ...................................................................... 12 I NSTRUMENT I MPROVEMENT .......................................................................... 12 Pinhole Size ................................................................................................ 12 Camera Length ........................................................................................... 12 S UN S A NGULAR S IZE .................................................................................... 13 INFORMATION FOR TEACHERS .......................................................... 14 R ATIO M ETHOD .............................................................................................. 14 T RIGONOMETRIC M ETHOD ............................................................................. 15 APPENDIX A .................................................................................................. 16 T HE S UN S D IMENSIONS ................................................................................ 16
SOLAR-B PINHOLE CAMERA Solar-B Touch the Sun , Chabot Space & Science Center 4 Pinhole Camera Introduction Description Solar-B will use mirrors, lenses, CCD cameras, and other optical components to form images of the Sun. From these images the sizes of objects and events on the Sun – and the Sun’s disk itself – can be measured. You will measure the diameter of the Sun using aluminum foil, a cardboard tube, graph paper, and a pin! Above: The disk of the Sun shown with a scale of angular separation on the sky. The Sun’s disk is approximately one half degree across as seen from Earth. A pinhole camera is the world’s simplest image-forming device. You may believe that the only way to take a picture is with an expensive set of lenses and other mechanical accessories. After all, human eyes and cameras and

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