Have you ever wondered at what stage you can see the new crescent moon?
The next new moon will occur on Thursday February 15th 2018 at 21:05 GMT/UT
marking the start of lunation 1177.
The timing of February's new moon means that sightings of the new crescent
Moon on Thursday February 15th are extremely unlikely except for observers with
the most specialist equipment. On Friday February 16th, observers with
conventional amateur-sized telescopes based in the south-western part of the
Arabian Peninsula, eastern and southern parts of Africa, coastal regions
surrounding the western Mediterranean Sea and northern Spain may be able to
sight the new crescent Moon. Naked-eye sightings of the crescent moon under
excellent conditions may be possible from westernmost parts of Africa, the
Azores, the Canary Islands, northern parts of the United States, southern parts
of Canada and most of the northern part of South America. Easy sightings on the
same day, February 16th, should be possible from south-western parts of the
United States, Central America, north-western parts of South America and the
eastern half of the Pacific Ocean region. Easy sightings of the new crescent
moon should be possible globally on Saturday February 17th with the possible
exceptions of the South Island of New Zealand and Tasmania. These exceptions
will have to wait until the following day to make their sightings. We would
therefore ask observers to make their sightings of the new crescent Moon
between February 15th and February 18th and report them to us.
If you go out just after sunset over the three or four days following the
instant of new moon and have a look low in the western half of the sky near
where the Sun set, you can try and observe the new crescent moon.
You can make the observation with just your eyes or with binoculars or
a telescope. Never look at the Sun directly
or through binoculars or a telescope as you will damage your eyesight.
If you are going to use binoculars or a telescope to find the new
crescent moon, you must make sure the Sun has set.
The crescent moon will be faint shortly after new moon but will brighten
from night to night as the crescent thickens. Cloud or aircraft vapour
trails can easily be mistaken for the Moon so be careful when making the
Scan the western horizon close to where the Sun set. If you can see the
Moon, let us know by entering your observation and location in our report
form. We need to know the date and time of your observation, what the
crescent looked like, where it was in the sky relative to the position
on the horizon where the Sun set and something about the weather
conditions and you, the observer. Even if the weather is clear and you
cannot see the Moon, let us know. A negative observation will also help
Come back to this site later in the month and you can find out what you
should have seen from your observing site. You can also sign up for an
e-mail reminder of the date and time of the next new moon so you can try
your observing skills again.
Over time, we will process your observations and try to improve the models
we use to predict the first sighting of the new crescent moon. Currently,
these predictions produce a classification for a particular date and
location ranging from A (crescent easily visible) through to F (crescent
impossible to see).
For those groups who use the first sighting of the new crescent moon in
their calendars, these predictions are very significant and mark the
beginning and end of periods of fasting and festivals.
More information on these predictions is
available on this site.
This site allows observers to look at the global visibility of the
next new moon, to check their
observations of the last new moon, to
report their observations and to
receive/stop e-mail reminders of the next new
Preliminary results will also be reported on the site when they become available.
Further information on the visibility of the new crescent moon for a specific
location can be found on our Websurf
site by selecting the Crescent Moon Visibility option from the menu.
|What we want you to do|
- Go out each evening following the day of the new moon.
- Find a westerly facing spot with a clear view of the horizon.
- Wait for the Sun to set, then look for the crescent moon in that part of the sky.
- Don't look directly at the Sun, using your naked eye, binoculars or a telescope.
- Can you see the crescent moon? Are you sure? Is it a cloud or a vapour trail?
- Make a note of where you were, the date and time of your observation, the weather conditions and whether you saw the Moon or not.
- Come to this website and report your observation.
- Try and observe the crescent moon each night until you see it, reporting each observation attempt.
- Sign up for an e-mail reminder of the next new moon and come back next month and try the same thing again.