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| author | Chong Yidong | 2009-08-09 23:39:59 +0000 |
|---|---|---|
| committer | Chong Yidong | 2009-08-09 23:39:59 +0000 |
| commit | 4c39f404d52c888bd314a3ffed4c6306537343fe (patch) | |
| tree | 0e9346e0722fd3a864b264a5763176af1913500d /doc/misc | |
| parent | a9cc50d99941cb175c93c732df3b1fb12a72419f (diff) | |
| download | emacs-4c39f404d52c888bd314a3ffed4c6306537343fe.tar.gz emacs-4c39f404d52c888bd314a3ffed4c6306537343fe.zip | |
* calc.texi (Date Forms): Fix typos.
Diffstat (limited to 'doc/misc')
| -rw-r--r-- | doc/misc/ChangeLog | 4 | ||||
| -rw-r--r-- | doc/misc/calc.texi | 30 |
2 files changed, 19 insertions, 15 deletions
diff --git a/doc/misc/ChangeLog b/doc/misc/ChangeLog index 0ec28f3c160..e0fbe264175 100644 --- a/doc/misc/ChangeLog +++ b/doc/misc/ChangeLog | |||
| @@ -1,3 +1,7 @@ | |||
| 1 | 2009-08-09 Colin Williams <lackita@gmail.com> (tiny change) | ||
| 2 | |||
| 3 | * calc.texi (Date Forms): Fix typos. | ||
| 4 | |||
| 1 | 2009-08-08 Glenn Morris <rgm@gnu.org> | 5 | 2009-08-08 Glenn Morris <rgm@gnu.org> |
| 2 | 6 | ||
| 3 | * org.texi (Agenda commands): Restore clobbered change. | 7 | * org.texi (Agenda commands): Restore clobbered change. |
diff --git a/doc/misc/calc.texi b/doc/misc/calc.texi index 4653a9446a4..49a5260af6c 100644 --- a/doc/misc/calc.texi +++ b/doc/misc/calc.texi | |||
| @@ -11093,29 +11093,29 @@ days 0 and @mathit{-1} respectively in Calc's internal numbering scheme. | |||
| 11093 | 11093 | ||
| 11094 | @cindex Julian day counting | 11094 | @cindex Julian day counting |
| 11095 | Another day counting system in common use is, confusingly, also called | 11095 | Another day counting system in common use is, confusingly, also called |
| 11096 | ``Julian.'' The Julian day number is the numbers of days since | 11096 | ``Julian.'' The Julian day number is the numbers of days since |
| 11097 | 12:00 noon (GMT) on Jan 1, 4713 BC, which in Calc's scheme (in GMT) | 11097 | 12:00 noon (GMT) on Jan 1, 4713 BC, which in Calc's scheme (in GMT) |
| 11098 | is @mathit{-1721423.5} (recall that Calc starts at midnight instead | 11098 | is @mathit{-1721423.5} (recall that Calc starts at midnight instead |
| 11099 | of noon). Thus to convert a Calc date code obtained by unpacking a | 11099 | of noon). Thus to convert a Calc date code obtained by unpacking a |
| 11100 | date form into a Julian day number, simply add 1721423.5 after | 11100 | date form into a Julian day number, simply add 1721423.5 after |
| 11101 | compensating for the time zone difference. The built-in @kbd{t J} | 11101 | compensating for the time zone difference. The built-in @kbd{t J} |
| 11102 | command performs this conversion for you. | 11102 | command performs this conversion for you. |
| 11103 | 11103 | ||
| 11104 | The Julian day number is based on the Julian cycle, which was invented | 11104 | The Julian day number is based on the Julian cycle, which was invented |
| 11105 | in 1583 by Joseph Justus Scaliger. Scaliger named it the Julian cycle | 11105 | in 1583 by Joseph Justus Scaliger. Scaliger named it the Julian cycle |
| 11106 | since it is involves the Julian calendar, but some have suggested that | 11106 | since it involves the Julian calendar, but some have suggested that |
| 11107 | Scaliger named it in honor of his father, Julius Caesar Scaliger. The | 11107 | Scaliger named it in honor of his father, Julius Caesar Scaliger. The |
| 11108 | Julian cycle is based it on three other cycles: the indiction cycle, | 11108 | Julian cycle is based on three other cycles: the indiction cycle, the |
| 11109 | the Metonic cycle, and the solar cycle. The indiction cycle is a 15 | 11109 | Metonic cycle, and the solar cycle. The indiction cycle is a 15 year |
| 11110 | year cycle originally used by the Romans for tax purposes but later | 11110 | cycle originally used by the Romans for tax purposes but later used to |
| 11111 | used to date medieval documents. The Metonic cycle is a 19 year | 11111 | date medieval documents. The Metonic cycle is a 19 year cycle; 19 |
| 11112 | cycle; 19 years is close to being a common multiple of a solar year | 11112 | years is close to being a common multiple of a solar year and a lunar |
| 11113 | and a lunar month, and so every 19 years the phases of the moon will | 11113 | month, and so every 19 years the phases of the moon will occur on the |
| 11114 | occur on the same days of the year. The solar cycle is a 28 year | 11114 | same days of the year. The solar cycle is a 28 year cycle; the Julian |
| 11115 | cycle; the Julian calendar repeats itself every 28 years. The | 11115 | calendar repeats itself every 28 years. The smallest time period |
| 11116 | smallest time period which contains multiples of all three cycles is | 11116 | which contains multiples of all three cycles is the least common |
| 11117 | the least common multiple of 15 years, 19 years and 28 years, which | 11117 | multiple of 15 years, 19 years and 28 years, which (since they're |
| 11118 | (since they're pairwise relatively prime) is | 11118 | pairwise relatively prime) is |
| 11119 | @texline @math{15\times 19\times 28 = 7980} years. | 11119 | @texline @math{15\times 19\times 28 = 7980} years. |
| 11120 | @infoline 15*19*28 = 7980 years. | 11120 | @infoline 15*19*28 = 7980 years. |
| 11121 | This is the length of a Julian cycle. Working backwards, the previous | 11121 | This is the length of a Julian cycle. Working backwards, the previous |