|
Re: SEXTANT input data for locations
#file-notice
Symbols and abbreviations for worksheet
?
- Hs: Sextant height/altitude
- Ha: Apparent sextant height/altitude
- Ho: Observed sextant height/altitude
- Dip: Depression of the horizon
- Sun corr.: Sun’s altitude correction table
- Date: Date of the UT observation
- UT time: Universal time
- Index error: Refers to the alignment of its optical components
- Non adjustable error: Fixed error due machining issues
- ε: Index error plus non-adjustable error
- L: Estimated latitude
- G: Estimated longitude
- height of the eye: Height of the eye above the horizon
- LL/UP: Lower limb or upper limb of the sun
- GHA: Greenwich Hour Angle of the sun (whole hour)
- pp: Increment of the sun’s hour angle
- GHA: Greenwich Hour Angle of the sun (exact hour of the observation)
- P: Polar Hour Angle
- D: Declination of the sun (whole hour)
- corr.d : Change of declination per hour
- D: Declination of the sun (exact hour of the observation)
- Hc: Calculated height/altitude
- Z: true azimuth (o° to 180°) ancient notation
- Zv: true azimuth (0° to 360°) modern notation
- intercept: Ho- Hc
? |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
SEXTANT input data for locations
#file-notice
Here is a pdf file on the basic inputs used for location?
?
? |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Search Engine List
? ??
Search Engine in excel file below
?
General
? Main website is a portal Geographically localized
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Re: Candle power engines.
开云体育never saw a candle powered one before.? But I do have a Stirling engine for my tea cup.On 25-Mar-25 10:37, davesmith1800
wrote:
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Using g a Sextant made easy
You find where are? 4 times year you do not need any table or chart
Apx March 20 and September 20 at noon is zero Apx June 20 and December 20 at noon is The axial tilt of Earth is currently about 23.44° off center Use formula at solar noon for Mar 20 and September 20 Note: Solar Noon is when the shadow line points true north (not magnetic north) Take a read using a pan of aka Artificial Horizon Remember it center of sun just take a reading top and bottom advantage the two readings. ? {Artificial Horizon} angle needs to be divided by 2 ?  Now lookup the Atmosphere Refraction angle.?The chart here is in minutes   Now on March 20 or September 20 no adjustment for?D.  Altitude?- 90° =?? Latitude?=?D?+/-?? *** Note if on a ship ? using the ocean Horizon you need to adjust for angle from standing to ocean. If use a bubble sextant instead of a Artificial Horizon no need to divide by two. *** This only works apx March 20 and September 20 The 23.44° or 23 degrees 26.4 minutes. Is only works in ar noon June 20 and Dec 20 by adding or subtracting. All other you need to use a table or calculate the angle of the sun to determine the sun angle ?????? ?????? Now if read the internet. You never be able to do latitude. Dave |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Day you had no GPS on a road trip
In 1803 when steam engine was a latest and greatest of day. Lewis & Clark had no GPS and they on dry land now what. ? They had Sextant &? Octant (45°/90° sextant)? with Artificial Horizon (pan of water and wind shield) and a good clock had keep good time for years. ? Sextant ? ?? Octant using a Peep sight only 45°/90° ? ? ? Artificial Horizon with glass wind break ? ?? ? How the Artificial Horizon was used in the 1800's on land. ? ? Theodolites better than Transit ? ? Hightly actuate Clock for yeas used on ships for Navigation ? ? This what Lewis and Clark used for first tip across America by any one. Map of Lewis & Clark trip More on Lewis & Clark Trip see links below. ? ? ? ? Dave |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Artificial Horizon using a cake pan and sextant
Here the way for a Artificial Horizon using a 9x13 card pan aka Ford parts pan. Since the sextant measures a angle. The sun reflects off water This gives angle of sun reflection and the sun just devide the angle in haft. Dave ??????
? Long way off the internet ? Below? In a location away from the sea where the horizon is not immediately visible, it is not possible to take Altitudes of celestial bodies with the Sextant in the usual way.  One way to work around this problem is to use an artificial horizon. The artificial horizon can be made with a plate, filled with some liquid. Water will do, but oil is better. A pool can also be used, if there is no wind or waves (the water surface must be completely flat). The purpose of the liquid is to obtain an ideal horizontal (reflecting) surface. The following must be considered for determining the Observed Altitude (Ho) from measurements with the artificial horizon as described above: The index error as well as the sextant reading must be divided by two. The Dip Correction and Semi-Diameter Correction must be set to zero.  |
davesmith1800
Jerry Durand