360-day calendar year?

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360-day calendar year?

Irv Bromberg
Dear Kalendarists:

Has anyone heard of an actually used calendar that had or has a 360-day year?

-- Irv Bromberg, Toronto, Canada

http://www.sym454.org/
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Re: 360-day calendar year?

Victor Engel
Dear Irv,

Have you seen this website?

Victor

On Mon, Feb 13, 2017 at 2:53 PM, Irv Bromberg <[hidden email]> wrote:
Dear Kalendarists:

Has anyone heard of an actually used calendar that had or has a 360-day year?

-- Irv Bromberg, Toronto, Canada

http://www.sym454.org/

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Re: 360-day calendar year?

Christoph Päper-2
In reply to this post by Irv Bromberg
Irv Bromberg <[hidden email]>:
>
> Has anyone heard of an actually used calendar that had or has a 360-day year?

Fiscal and administrative calendars don’t count, I presume?
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Re: 360-day calendar year?

Karl Palmen
In reply to this post by Victor Engel

Dear Irv, Victor and Calendar People

 

The website does mention the Maya long count in which a Tun lasts 360 days.

 

I have worked out various solar and lunar cycles that have a whole number of 360-day years.

 

Solar:

Years  Tun  Drifts  Leap Mean Year

  206  209    3      50  365.242718

5631 5713   82    1365  365.242408

5425 5504   79    1315  365.242396

5219 5295   76    1265  365.242384

5013 5086   73    1215  365.242370

4807 4877   70    1165  365.242355

4601 4668   67    1115  365.242339

4395 4459   64    1065  365.242321 (6174 tzolkins of 260 days)

4189 4250   61    1015  365.242301

3983 4041   58     965  365.242280

3777 3832   55     915  365.242256

3571 3623   52     865  365.242229

3365 3414   49     815  365.242199

3159 3205   46     765  365.242165

2953 2996   43     715  365.242127

2747 2787   40     665  365.242082

2541 2578   37     615  365.242031

2335 2369   34     565  365.241970

2129 2160   31     515  365.241898

1923 1951   28     465  365.241810

1717 1742   25     415  365.241701 (2412 tzolkins of 260 days)

1511 1533   22     365  365.241562 (1512 years of 365 days)

 

Lunar:

 Tun  Months Yerms Mean Month

 886  10801   661  29.530599

1059  12910   790  29.530596

1232  15019   919  29.5305946

1405  17128  1048  29.5305932

1578  19237  1177  29.5305921

1751  21346  1306  29.5305912

1924  23455  1435  29.5305905 (2664 tzolkins of 260 days)

2097  25564  1564  29.5305899

 173   2109   129  29.530583

1190  14507   887  29.530571

1017  12398   758  29.530569

 844  10289   629  29.530566

 671   8180   500  29.530562

 498   6071   371  29.530555

 

I’ve not found any lunisolar cycles a multiple of 360 days.

 

Karl

 

16(06(18

 

From: East Carolina University Calendar discussion List [mailto:[hidden email]] On Behalf Of Victor Engel
Sent: 13 February 2017 21:01
To: [hidden email]
Subject: Re: 360-day calendar year?

 

Dear Irv,

 

Have you seen this website?

 

Victor

 

On Mon, Feb 13, 2017 at 2:53 PM, Irv Bromberg <[hidden email]> wrote:

Dear Kalendarists:

Has anyone heard of an actually used calendar that had or has a 360-day year?

-- Irv Bromberg, Toronto, Canada

http://www.sym454.org/

 

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Re: 360-day calendar year?

Karl Palmen

Dear Calendar People

 

I thought of looking for some lunisolar cycles a multiple of 360 days and find

 

Tun  Years Months Trunc  Mean Year  Mean Month

2160 2129  26332    7    365.241898 29.530609

3135 3090  38218    8    365.242718 29.530588

 

Where Trunc is the number of 19-year cycles truncated by removing an Octaeteris.

 

The 2129-year cycle is listed as a solar cycle and has 2^7 * 3^5 * 5^2 days.

The 3090-year cycle is equal to fifteen 206-year cycles listed as a solar cycle.

 

Karl

 

16(06(19

 

From: Palmen, Karl (STFC,RAL,ISIS)
Sent: 14 February 2017 13:03
To: [hidden email]
Subject: RE: 360-day calendar year?

 

Dear Irv, Victor and Calendar People

 

The website does mention the Maya long count in which a Tun lasts 360 days.

 

I have worked out various solar and lunar cycles that have a whole number of 360-day years.

 

Solar:

Years  Tun  Drifts  Leap Mean Year

 206  209    3      50  365.242718

5631 5713   82    1365  365.242408

5425 5504   79    1315  365.242396

5219 5295   76    1265  365.242384

5013 5086   73    1215  365.242370

4807 4877   70    1165  365.242355

4601 4668   67    1115  365.242339

4395 4459   64    1065  365.242321 (6174 tzolkins of 260 days)

4189 4250   61    1015  365.242301

3983 4041   58     965  365.242280

3777 3832   55     915  365.242256

3571 3623   52     865  365.242229

3365 3414   49     815  365.242199

3159 3205   46     765  365.242165

2953 2996   43     715  365.242127

2747 2787   40     665  365.242082

2541 2578   37     615  365.242031

2335 2369   34     565  365.241970

2129 2160   31     515  365.241898

1923 1951   28     465  365.241810

1717 1742   25     415  365.241701 (2412 tzolkins of 260 days)

1511 1533   22     365  365.241562 (1512 years of 365 days)

 

Lunar:

 Tun  Months Yerms Mean Month

 886  10801   661  29.530599

1059  12910   790  29.530596

1232  15019   919  29.5305946

1405  17128  1048  29.5305932

1578  19237  1177  29.5305921

1751  21346  1306  29.5305912

1924  23455  1435  29.5305905 (2664 tzolkins of 260 days)

2097  25564  1564  29.5305899

 173   2109   129  29.530583

1190  14507   887  29.530571

1017  12398   758  29.530569

 844  10289   629  29.530566

 671   8180   500  29.530562

 498   6071   371  29.530555

 

I’ve not found any lunisolar cycles a multiple of 360 days.

 

Karl

 

16(06(18

 

From: East Carolina University Calendar discussion List [[hidden email]] On Behalf Of Victor Engel
Sent: 13 February 2017 21:01
To: [hidden email]
Subject: Re: 360-day calendar year?

 

Dear Irv,

 

Have you seen this website?

 

Victor

 

On Mon, Feb 13, 2017 at 2:53 PM, Irv Bromberg <[hidden email]> wrote:

Dear Kalendarists:

Has anyone heard of an actually used calendar that had or has a 360-day year?

-- Irv Bromberg, Toronto, Canada

http://www.sym454.org/