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Doc: fix discussion of how to get real Julian Dates.
Somehow I'd convinced myself that rotating to UTC-12 was the way to do this, but upon further review, it's definitely UTC+12. Discussion: https://postgr.es/m/1197050.1619123213@sss.pgh.pa.us
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@ -908,22 +908,22 @@ $ <userinput>cal 9 1752</userinput>
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<para>
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This definition does, however, provide a way to obtain the astronomical
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definition when you need it: do the arithmetic in time
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zone <literal>UTC-12</literal>. For example,
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zone <literal>UTC+12</literal>. For example,
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<programlisting>
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=> SELECT extract(julian from '2021-06-23 7:00:00-04'::timestamptz at time zone 'UTC-12');
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=> SELECT extract(julian from '2021-06-23 7:00:00-04'::timestamptz at time zone 'UTC+12');
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date_part
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--------------------
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2459389.9583333335
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2459388.9583333335
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(1 row)
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=> SELECT extract(julian from '2021-06-23 8:00:00-04'::timestamptz at time zone 'UTC-12');
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=> SELECT extract(julian from '2021-06-23 8:00:00-04'::timestamptz at time zone 'UTC+12');
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date_part
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-----------
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2459390
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2459389
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(1 row)
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=> SELECT extract(julian from date '2021-06-24');
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=> SELECT extract(julian from date '2021-06-23');
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date_part
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-----------
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2459390
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2459389
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(1 row)
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</programlisting>
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</para>
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