<p>You need an <a href="https://en.wikipedia.org/wiki/Orrery" rel="nofollow noreferrer">Orrery</a>. Specifically, one that includes Earth’s rotation.</p>

<p>My noting the meridian on the model Earth, you can <em>see</em> how the Earth may be rotated some amount each time the Moon passes on a line between the Earth and Sun.</p>

<p>The <a href="https://en.wikipedia.org/wiki/New_moon#Determining_new_moons:_an_approximate_formula" rel="nofollow noreferrer">wikipedia</a> page gives a formula.  Take the result (given in UT) and apply the timezone offset for the desired longitude.</p>

<p>The same page discusses Lunar calindars and may have the info you are really interested in.</p>

CC BY-SA 3.0
2016-12-07T11:48:14.083Z
2016-12-07T11:48:14.083Z
JDługosz
<p>I have read that Chinese months start on the day on which the new moon is observed from the 120th meridian east.  From this I am assuming that the new moon is observable from there each time and that it doesn't matter where on the meridian you are (although I suppose it's implied you're in the northern hemisphere).</p>

<p>How can I calculate the time at which the moon is new from a particular meridian?</p>

<the-moon><moon-phases>
How can I calculate when the new moon will be observed from a particular meridian?
TiesRent
# How can I calculate when the new moon will be observed from a particular meridian?

(Asked by: username_0 on 2016-12-05)

I have read that Chinese months start on the day on which the new moon is observed from the 120th meridian east. From this I am assuming that the new moon is observable from there each time and that it doesn't matter where on the meridian you are (although I suppose it's implied you're in the northern hemisphere).

How can I calculate the time at which the moon is new from a particular meridian?

**Tags:** the-moon, moon-phases

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## 1 answers

### Answer by username_1 on 2016-12-07. Score: 1

You need an [Orrery](https://en.wikipedia.org/wiki/Orrery). Specifically, one that includes Earth’s rotation.

My noting the meridian on the model Earth, you can *see* how the Earth may be rotated some amount each time the Moon passes on a line between the Earth and Sun.

The [wikipedia](https://en.wikipedia.org/wiki/New_moon#Determining_new_moons:_an_approximate_formula) page gives a formula. Take the result (given in UT) and apply the timezone offset for the desired longitude.

The same page discusses Lunar calindars and may have the info you are really interested in.


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