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Bug #65547 Default value for sunrise/sunset zenith still wrong
Submitted: 2013-08-25 09:31 UTC Modified: 2018-02-08 17:16 UTC
Avg. Score:5.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: df1986 at aol dot com Assigned:
Status: Closed Package: Date/time related
PHP Version: 5.4.19 OS: All
Private report: No CVE-ID: None
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 [2013-08-25 09:31 UTC] df1986 at aol dot com
I have discovered this bug report filed 
several years ago which, quite correctly, points out that php's default zenith 
is 90 + 35/60.

However, the official algorithm from the 1990 Almanac for Computers published by 
the Nautical Almanac Office at the United States Naval Observatory (which can be 
found at quite 
clearly says that the correct value is 90+50/60.

The old bug was closed as bogus with a message saying that "the algorithm code 
we use clearly says 35/60". That statement is nothing more than a tautology. It 
says "the code should be 35/60 because if you look at the code, it says 35/60", 
and does nothing to answer where this value came from, or why it differs from 
the canonical value. Some commenters had noted this, but there was no response.

As such, I'd like to reopen this bug and see it correctly fixed, rather than 
simply swept under the carpet.

Test script:
echo ini_get("date.sunset_zenith"), "\n", ini_get("date.sunrise_zenith"), "\n", (90 + 50/60), "\n";

Expected result:

Actual result:


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 [2018-02-08 17:16 UTC]
-Status: Open +Status: Verified
 [2018-02-08 17:16 UTC]
Yes, you're right.
<> explains why it
should be 90° 50'.
 [2019-07-15 08:46 UTC]
The following pull request has been associated:

Patch Name: Fix #65547: Default value for sunrise/sunset zenith still wrong
On GitHub:
 [2019-07-15 11:52 UTC]
Automatic comment on behalf of
Log: Fix #65547: Default value for sunrise/sunset zenith still wrong
 [2019-07-15 11:52 UTC]
-Status: Verified +Status: Closed
 [2021-01-15 22:43 UTC] a at b dot c dot de
Documentation still needs updating (date_sunrise, date_sunset, datetime.configuration). They still use the 35' figure.
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