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Re: Sextant practice, experimentation --Saturday in RI.
From: Bruce J. Pennino
Date: 2013 Sep 29, 10:08 -0400

Hello:

We met at Beavertail Light and had a good day. Perfect weather. The "Light" Association is building a new platform on the old Light Foundation. FER and I surveyed the elevation of the ground on the south side of the road, just south of the fog horn device; at the edge of the bluff. The ground at this point is very close to the elevation of the new platform. The ground elevation is 25 ft more or less above MSL. FER may want to refine this value.

With my total station I had a HoE of 29.6 ft when I measured a dip angle (mean) of 5 min 14 seconds. Air temp was 64 F, water temp, 65 F, atmos. P 30.27 ", Wind @ 6 mph. Frank and I used the theodolite to sight the UL of moon. I read the angles and FER observed time GPS/UT

Herewith are the ZENITH angles where 0 deg is vertical with times:

GMT/UT 16 hr 36 min 38.3 seconds ZD 66d 18' 09"

16 hr 37 min 42.7 seconds ZD 66 d 30' 03"

The fractional second of time is estimated by FER

An excellent location for walking, picnics, and CN observations. Crowded and busy on weekends, but plenty of parking.

Best regards,

Bruce

----- Original Message -----

From: Bruce J. Pennino

To: bpennino.ce@charter.net

Sent: Friday, September 27, 2013 2:37 PM

Subject: [NavList] Re: Sextant practice, experimentation --Saturday in RI.

Hello: I hope to be there with my theodolite and surveying equipment. I'll measure dip, show everyone how easy it is, and maybe determine the height of eye. Also establish a bench mark for future use? For HoE I must get a person with the prism down to near the water. Maybe use other estimating techniques because rocks appear to make a tough climb. However, if we can get a person to within 5 or 6 ft of water level, we can get a pretty accurate value. I expect FER has been using this site for years and knows the ground elevation . There is probably a USCGS survey marker set in the rocks somewhere nearby. I'll try to find it in their system. Anybody seen one there? I'll try to be early for setup. Bruce ----- Original Message ----- From: Frank Reed To: bpennino.ce{at}charter.net Sent: Thursday, September 26, 2013 10:55 PM Subject: [NavList] Sextant practice, experimentation --Saturday in RI. Saturday, September 28, Beavertail Point. 12:15 - 1:30pm. Note that local noon is right in the middle of this period, perfect for Noon Sun sights. The Moon will also be "in distance" so we can try lunars or get sights for a standard two-body fix. There is ample parking. We will be close to the lighthouse itself, either just south of it or possibly just west of it. Look for sextants. Details at http://reednavigation.com/sightopps -FER ---------------------------------------------------------------- NavList message boards and member settings: www.fer3.com/NavList Members may optionally receive posts by email. To cancel email delivery, send a message to NoMail[at]fer3.com ---------------------------------------------------------------- : http://fer3.com/arc/m2.aspx?i=125223

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