File:Calculation for How Much of a Distant Object is Visible to Observer.jpg
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Captions
Captions
Calculation for How Much of a Distant Object (in this case, a Lighthouse with known height above sea level) is Visible to Observer with known sight level and known distance from Lighthouse
Summary edit
| Description |
English: This figure provides calculations for how much of a distant object is visible to an observer.
Measurements are given in feet and miles. An example is given for an observer (ho) with eye level of 6 feet above sea level, to a lighthouse 130 feet above sea level (h2), 15 miles away (do) from observer. Earth's radius is assumed to be 3,960 miles. Atmospheric refraction is not taken into account. |
| Date | |
| Source | Own work |
| Author | Jim slater307 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:01, 23 October 2021 | | 2,080 × 1,026 (350 KB) | Jim slater307 (talk | contribs) | Height of Lighthouse above Horizon (23Oct2021).jpg |
| 22:05, 22 October 2021 |  | 2,346 × 1,107 (429 KB) | Jim slater307 (talk | contribs) | made image larger for so text is more legible | |
| 19:44, 22 October 2021 |  | 2,080 × 1,026 (375 KB) | Jim slater307 (talk | contribs) | Uploaded own work with UploadWizard |
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