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ERIC Number: EJ930500
Record Type: Journal
Publication Date: 2010-Jul
Pages: 4
Abstractor: As Provided
Reference Count: 10
ISSN: ISSN-0031-9120
The Thin Border between Light and Shadow
Guglielmino, M.; Gratton, L. M.; Oss, S.
Physics Education, v45 n4 p378-381 Jul 2010
We propose a simple, direct estimate of the Sun's diameter based on penumbra observation and measurement in a two-level approach, the first for middle-school pupils and making use of simple geometrical arguments, the second more appropriate to high-school students and based on a slightly more sophisticated approach. (Contains 5 figures.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: High Schools; Middle Schools
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A