Opposition and Conjunction showing opposite results for `moon`

Opposition and Conjunction using the code in the below link for moon giving opposite results [https://rhodesmill.org/skyfield/almanac.html#opposition-and-conjunction] Below is the output for the year 2019 where the opposition are shown as conjunction and vice versa.

['2019-01-06T01:28:11Z', '2019-01-21T05:16:05Z', '2019-02-04T21:03:35Z', '2019-02-19T15:53:35Z', '2019-03-06T16:04:00Z', '2019-03-21T01:42:53Z', '2019-04-05T08:50:30Z', '2019-04-19T11:12:11Z', '2019-05-04T22:45:31Z', '2019-05-18T21:11:22Z', '2019-06-03T10:01:57Z', '2019-06-17T08:30:40Z', '2019-07-02T19:16:13Z', '2019-07-16T21:38:13Z', '2019-08-01T03:11:56Z', '2019-08-15T12:29:16Z', '2019-08-30T10:37:10Z', '2019-09-14T04:32:48Z', '2019-09-28T18:26:23Z', '2019-10-13T21:07:54Z', '2019-10-28T03:38:29Z', '2019-11-12T13:34:25Z', '2019-11-26T15:05:36Z', '2019-12-12T05:12:16Z', '2019-12-26T05:13:08Z'] [1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1] ['opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition', 'conjunction', 'opposition'] Wherever it is showing opposition the SUN and MOON were in conjunction on those dates and vice versa. Is this a bug in skyfield

[skynoob-new]

Thank you. Yes, your explanation looks apt. Thanks for your time

[brandon-rhodes]

Yes, the Moon will still show the same thing as in your example, because the definition of the function is not changing — it still measures east-or-west-of-the-sun. But the documentation is now being clear what happens if you give it the Moon which, because it’s not a planet and doesn’t move across the sky like one, enters the east and west halves of the sky in the opposite order from how a planet does.