Worksheet 1 · Skill 8

Light rising

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1. On a clear night your height of eye is 19 ft. You are closing a light listed as 30 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  

2. On a clear night your height of eye is 18 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  

3. On a clear night your height of eye is 14 ft. You are closing a light listed as 35 ft high, nominal range 21 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  

4. On a clear night your height of eye is 21 ft. You are closing a light listed as 100 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 12 ft. You are closing a light listed as 50 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 21 ft. You are closing a light listed as 35 ft high, nominal range 21 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 16 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  

8. On a clear night your height of eye is 24 ft. You are closing a light listed as 60 ft high, nominal range 16 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