Worksheet 13 · Skill 8

Light rising

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1. On a clear night your height of eye is 5 ft. You are closing a light listed as 95 ft high, nominal range 17 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

2. On a clear night your height of eye is 4 ft. You are closing a light listed as 150 ft high, nominal range 9 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

3. On a clear night your height of eye is 7 ft. You are closing Heron Point Light (Fl W 4s 52ft 14M).

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

4. On a clear night your height of eye is 4 ft. You are closing a light listed as 80 ft high, nominal range 7 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

5. On a clear night your height of eye is 7 ft. You are closing a light listed as 95 ft high, nominal range 17 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

6. On a clear night your height of eye is 11 ft. You are closing a light listed as 65 ft high, nominal range 6 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

7. On a clear night your height of eye is 23 ft. You are closing a light listed as 25 ft high, nominal range 9 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm  

8. On a clear night your height of eye is 5 ft. You are closing a light listed as 65 ft high, nominal range 10 nm.

   Find its geographic range (how far off its light first clears the horizon for you) and the distance at which you should first see it. Take the nominal range as its luminous range on this clear night.

   Use the horizon distance d = 1.17 × √h (nm, h in feet). Tolerance: 0.15 nm.

   Geographic range: ________ nm   First seen at: ________ nm