Mysteries :  The Official GrahamHancock.com forums
For serious discussion of the controversies, approaches and enigmas surrounding the origins and development of the human species and of human civilization. (NB: for more ‘out there’ posts we point you in the direction of the ‘Paranormal & Supernatural’ Message Board). 
Welcome! Log InRegister
I got the statement that the fathom was once defined as 1/100 of a cable, or 1/1000 of a nautical mile, or 1/1000 of a minute of latitude from a wikipedia article that gave the Oxford Dictionary of Weights, Measures and Units as the source of the definition. I found an inexpensive copy of the dictionary on the internet and decided to get it, partially to make sure it said what wikipedia said it said, and partially to see what else might be in the dictionary.

Sure enough, the dictionary says the fathom is usually 6 ft, but sometimes defined as 1/100 of a cable, and the dictionary says that the cable is defined by the Admiralty as 1/10 of a minute of latitude.

Here is a paragraph that is included in the definition of cubit: "The Great Pyramid of Ghiza was measured in the 1880s by Flinders Petrie as having sides of length 230.24 to 230.4m. with a mean of 230.355m. Postulating them as being 250 points to a cubit of about 461mm and a fathom of about 1.84m. i.e. very close to today's international nautical mile, the length of one minute of latitude. In turn this indicates that the Ancient Egyptians nearly 5000 years ago, measured Earth's radius." p. 53

First, I think Fenna meant to say 500 points to a cubit instead of 250, since 230.355/.461 = 499.7. Also, given a fathom equal to four cubits, 500 cubits equals 125 fathoms, and 230.355/125 = 1.842m. 1842m is a little bit short for an average minute of latitude, but it is accurate for minutes of latitude at the equator. Given 125 fathoms per side, this gives 500 fathoms for the perimeter, equal to 1/2 minute of latitude at the equator, which has of course been pointed out before, although perhaps not to my knowledge in fathoms.

The half-minute of latitude is a measure of the circumference and Fenna does not explain how he gets from there to radius, and a half minute of equatorial latitude x 2 x 60 x 360 / 2pi is still a bit short even for the polar radius, because the equatorial degrees of latitude are so short, but regardless of how he got there, I agree with him that the Ancient Egyptians did know the measure of the earth's radius and I was surprised and happy to find this statement in the current Oxford dictionary of weights, measures and units.

Options: ReplyQuote


Subject Views Written By Posted
Remen : Meridian 2318 Jim Alison 15-Nov-19 22:52
DUNE!: Remen : Meridian 226 PB Bytes 16-Nov-19 17:55
Re: DUNE!: Remen : Meridian 211 DUNE 17-Nov-19 09:56
Re: DUNE!: Remen : Meridian 183 Jim Alison 17-Nov-19 23:45
Re: DUNE!: Remen : Meridian 188 PB Bytes 17-Nov-19 23:59
Found it! 231 PB Bytes 18-Nov-19 02:55
Re: Found it! 189 Mercurial 20-Nov-19 11:44
Re: Found it! 168 Jim Alison 20-Nov-19 14:42
Squaring The Circle 199 Dr. Troglodyte 20-Nov-19 18:59
Re: Squaring The Circle 193 Jim Alison 20-Nov-19 20:02
Re: Squaring The Circle 182 Jim Alison 20-Nov-19 20:22
Remen references 200 Lee McGiffen 21-Nov-19 01:59
Re: Remen references 204 Jim Alison 21-Nov-19 04:29
Re: Remen references 173 magisterchessmutt 24-Nov-19 13:56
Re: Remen references 144 Jim Alison 24-Nov-19 20:05
Re: Remen references 161 magisterchessmutt 24-Nov-19 21:17
Re: Remen references 145 magisterchessmutt 25-Nov-19 01:24
Re: Remen references 144 magisterchessmutt 25-Nov-19 12:10
Re: Remen references 183 DUNE 25-Nov-19 13:17
Re: Remen references 117 Jim Alison 16-Jan-20 20:22
Drastic Geodetic Measures and Nippur Cubit 186 thinkitover 25-Nov-19 06:46
Re: Remen references 171 Jim Alison 26-Nov-19 08:04
Re: Remen references 195 Lee McGiffen 27-Nov-19 12:54
Re: Remen references 151 Mercurial 28-Nov-19 22:32
Re: Remen references 203 Jim Alison 01-Dec-19 06:15
Re: Squaring The Circle 205 magisterchessmutt 21-Nov-19 00:47
Re: Squaring The Circle 161 magisterchessmutt 21-Nov-19 02:32
Re: Squaring The Circle 158 Jim Alison 21-Nov-19 05:20
Re: Squaring The Circle 221 magisterchessmutt 21-Nov-19 06:26
Egyptian knowledge of √2 161 Lee McGiffen 22-Nov-19 06:39
Re: Egyptian knowledge of √2 141 magisterchessmutt 23-Nov-19 01:19
Re: Egyptian knowledge of √2 176 thinkitover 23-Nov-19 09:45
Re: Egyptian knowledge of √2 149 magisterchessmutt 23-Nov-19 14:42
Re: Egyptian knowledge of √2 144 PB Bytes 23-Nov-19 16:10
Everything Mick wrote here - 86 pages 155 geoffss 21-Nov-19 10:49
Re: Everything Mick wrote here - 86 pages 152 magisterchessmutt 21-Nov-19 11:54
Re: Squaring The Circle 120 molder 20-Dec-19 12:45
Re: Found it! 175 Mercurial 22-Nov-19 06:48
Re: Found it! 162 magisterchessmutt 22-Nov-19 12:01
Re: Found it! 157 PB Bytes 22-Nov-19 15:24
Re: Found it! 188 magisterchessmutt 22-Nov-19 23:55
Re: Found it! 151 PB Bytes 23-Nov-19 02:06
Re: Found it! 150 magisterchessmutt 23-Nov-19 02:36
Re: Found it! 150 PB Bytes 23-Nov-19 03:37
Re: Found it! 153 DUNE 23-Nov-19 18:42
Re: Found it! 140 PB Bytes 23-Nov-19 19:37
Re: Found it! 151 DUNE 23-Nov-19 20:14
Re: Found it! 141 PB Bytes 23-Nov-19 20:27
Re: Found it! 141 PB Bytes 23-Nov-19 20:46
Re: Found it! 148 DUNE 23-Nov-19 21:37
Re: Found it! 147 PB Bytes 23-Nov-19 21:55
Re: Found it! 153 DUNE 23-Nov-19 22:24
Re: Found it! 144 PB Bytes 23-Nov-19 22:44
Re: Found it! 199 PB Bytes 24-Nov-19 17:44
Re: Found it! 156 DUNE 24-Nov-19 18:29
Re: Found it! 156 PB Bytes 24-Nov-19 18:34
Re: Found it! 151 PB Bytes 23-Nov-19 20:59
Re: Found it! 147 magisterchessmutt 23-Nov-19 19:55
Totally debunked 151 Lee McGiffen 24-Nov-19 05:23
NOT Totally debunked 144 PB Bytes 24-Nov-19 05:41
eg: NOT Totally debunked 154 PB Bytes 24-Nov-19 06:12
Khufu <> Khafre 168 Dr. Troglodyte 23-Nov-19 00:28
Re: Khufu <> Khafre 144 Mercurial 24-Nov-19 19:12
Khufu <> Khafre - Update 103 Dr. Troglodyte 11-Jan-20 19:56
Re: Found it! 166 Jim Alison 23-Nov-19 01:35
Re: DUNE!: Remen : Meridian 161 magisterchessmutt 19-Nov-19 03:45
Re: DUNE!: Remen : Meridian 153 Jim Alison 19-Nov-19 14:05
Re: DUNE!: Remen : Meridian 157 magisterchessmutt 20-Nov-19 00:27
Re: DUNE!: Remen : Meridian 151 Jim Alison 20-Nov-19 15:34
Re: DUNE!: Remen : Meridian 146 magisterchessmutt 19-Nov-19 03:49
Re: DUNE!: Remen : Meridian 155 DUNE 19-Nov-19 10:37
Re: DUNE!: Remen : Meridian 152 Jim Alison 19-Nov-19 14:22
Re: DUNE!: Remen : Meridian 151 DUNE 19-Nov-19 15:37
Re: DUNE!: Remen : Meridian 145 Jim Alison 20-Nov-19 00:44
Re: DUNE!: Remen : Meridian 163 PB Bytes 19-Nov-19 16:43
Re: DUNE!: Remen : Meridian 149 Jim Alison 20-Nov-19 01:07
Re: DUNE!: Remen : Meridian 170 PB Bytes 20-Nov-19 01:38
Re: DUNE!: Remen : Meridian 150 Jim Alison 20-Nov-19 14:28
Where is this leading? 158 PB Bytes 21-Nov-19 17:19
Re: Where is this leading? 163 Lee McGiffen 22-Nov-19 06:49
Re: Remen : Meridian 170 PB Bytes 16-Nov-19 18:00
Re: Remen : Meridian 169 Jim Alison 16-Nov-19 22:09
Excellent! 176 thinkitover 16-Nov-19 18:29
Re: Excellent! 207 Jim Alison 16-Nov-19 22:24
Re: Excellent! 178 Lee McGiffen 18-Nov-19 07:36
Re: Excellent! 184 Jim Alison 18-Nov-19 15:55
Re: Excellent! 174 magisterchessmutt 19-Nov-19 03:57
Re: Remen : Meridian 167 Spiros 20-Nov-19 15:06
Re: Remen : Meridian 159 Spiros 20-Nov-19 19:28
Re: Remen : Meridian 155 Jim Alison 20-Nov-19 20:24
Re: Remen : Meridian 149 Spiros 20-Nov-19 22:25
Re: Remen : Meridian 185 Spiros 20-Nov-19 22:58
Re: Remen : Meridian 159 Spiros 20-Nov-19 23:49
Re: Remen : Meridian 160 Jim Alison 20-Nov-19 23:40
The Earth number 214 hendrik dirker 21-Nov-19 05:48
Re: The Earth number 186 Jim Alison 21-Nov-19 13:15
Re: The Earth number 168 molder 22-Nov-19 19:30
Re: The Earth number 152 Jim Alison 23-Nov-19 01:44
Geometry as Metrology? 178 thinkitover 23-Nov-19 22:56
Re: Geometry as Metrology? 166 magisterchessmutt 24-Nov-19 00:04
Re: Geometry as Metrology? 170 Jim Alison 24-Nov-19 01:16
Re: Geometry as Metrology? 192 magisterchessmutt 24-Nov-19 01:36
Re: Geometry as Metrology? 200 magisterchessmutt 24-Nov-19 01:49
Re: Remen : Meridian 236 magisterchessmutt 24-Nov-19 02:38
Re: Remen : Meridian 171 DavidK 11-Dec-19 23:26
Re: Remen : Meridian 152 DavidK 12-Dec-19 13:23
Re: Remen : Meridian 160 thinkitover 12-Dec-19 18:51
Re: Remen : Meridian 177 DavidK 12-Dec-19 21:27
Re: Remen : Meridian 131 Jiri Mruzek 13-Dec-19 00:55
Re: Remen : Meridian 123 DavidK 13-Dec-19 09:51
Re: Remen : Meridian 132 Jim Alison 13-Dec-19 03:48
Re: Remen : Meridian 124 magisterchessmutt 13-Dec-19 04:58
Re: Remen : Meridian 124 magisterchessmutt 13-Dec-19 05:44
Re: Remen : Meridian 127 DavidK 13-Dec-19 09:58
Re: Remen : Meridian 128 DavidK 13-Dec-19 09:15
Re: Remen : Meridian 123 magisterchessmutt 13-Dec-19 11:02
Re: Remen : Meridian 140 DavidK 13-Dec-19 11:07
Re: Earth circumference 154 drew 17-Dec-19 23:57
Re: Earth circumference 160 DavidK 18-Dec-19 11:29
Re: Earth circumference 155 drew 20-Dec-19 00:22
Re: Earth circumference 145 hendrik dirker 20-Dec-19 06:07
Re: Earth circumference 138 DavidK 20-Dec-19 13:27
Re: Earth circumference 123 hendrik dirker 21-Dec-19 12:48
Re: Earth circumference 132 Jim Alison 20-Dec-19 20:48
Re: Earth circumference 136 hendrik dirker 21-Dec-19 11:44
Re: Earth circumference 121 drew 20-Dec-19 23:48
Re: Remen : Meridian 128 Jim Alison 20-Dec-19 19:26
Re: Remen : Meridian 129 magisterchessmutt 21-Dec-19 01:54
Re: Remen : Meridian 128 Jim Alison 21-Dec-19 04:30
Re: Remen : Meridian 120 magisterchessmutt 21-Dec-19 07:43
Re: Remen : Meridian 122 DavidK 21-Dec-19 10:56
Re: Remen : Meridian 126 magisterchessmutt 21-Dec-19 11:24
Re: Remen : Meridian 120 magisterchessmutt 21-Dec-19 11:48
Re: Remen : Meridian 115 DavidK 21-Dec-19 16:08
Re: Remen : Meridian 139 DavidK 21-Dec-19 12:49
Re: Remen : Meridian 122 Jim Alison 21-Dec-19 15:19
Re: Remen : Meridian 121 molder 21-Dec-19 20:33
Re: Remen : Meridian 112 DavidK 21-Dec-19 23:49
Re: Remen : Meridian 121 Jim Alison 22-Dec-19 03:02
Re: Remen : Meridian 118 DavidK 22-Dec-19 10:30
Re: Roman measures Hang on let us get this right. 122 molder 22-Dec-19 13:03
Re: Roman measures Hang on let us get this right. 116 DavidK 22-Dec-19 15:01
Re: Roman measures Hang on let us get this right. 127 magisterchessmutt 22-Dec-19 17:13
Re: Roman measures Hang on let us get this right. 132 DavidK 22-Dec-19 17:32
Re: Roman measures Hang on let us get this right. 125 Jim Alison 24-Dec-19 05:23
Stecchini's Metrics 123 thinkitover 21-Dec-19 16:01
Re: Stecchini's Metrics 130 magisterchessmutt 21-Dec-19 17:17
Re: Stecchini's Metrics 123 thinkitover 24-Dec-19 15:06
Re: Remen : Meridian 127 drew 23-Dec-19 00:44
Re: Remen : Meridian 124 Jim Alison 23-Dec-19 02:55
Re: Remen : Meridian 137 DavidK 23-Dec-19 12:34
Re: Remen : Meridian 139 Jim Alison 24-Dec-19 01:09
Re: Remen : Meridian 119 drew 27-Dec-19 23:06
Re: Remen : Meridian 133 DavidK 27-Dec-19 23:59
Re: Remen : Meridian 130 drew 28-Dec-19 22:24
Re: Remen : Meridian 172 DavidK 29-Dec-19 00:50
Re: Remen : Meridian 88 Jim Alison 19-Apr-20 18:46
Re: Remen : Meridian 67 drew 22-Apr-20 23:44
Re: Remen : Meridian 79 magisterchessmutt 23-Apr-20 13:03
Re: Remen : Meridian 83 magisterchessmutt 24-Apr-20 08:14
Re: Remen : Meridian 122 Jim Alison 11-Jan-20 03:53
Re: Remen : Meridian 112 DavidK 11-Jan-20 13:54
The Egyptian Remen 14.58333r inches 144 DavidK 11-Jan-20 16:48
Re: Remen : Meridian 110 Jim Alison 22-Jan-20 00:10
Re: Remen : Meridian 112 Mercurial 22-Jan-20 20:59
say hello to rodz? 131 DavidK 11-Jan-20 18:01
Re: say hello to rodz? 112 thinkitover 12-Jan-20 06:03
Re: say hello to rodz? 122 DavidK 12-Jan-20 12:45
Re: say hello to rodz? 144 thinkitover 13-Jan-20 06:41
Re: Remen : Meridian 109 akitu 24-Apr-20 19:26


Sorry, only registered users may post in this forum.