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Moon Phases - 2016
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  January
2nd & 31st -  Last Quarter (L.Q.)
9th - New Moon (N.M.)
16th - First Quarter (F.Q.)
23rd - Full Moon (F.M.)


  February
8th - N.M. 
15th - F.Q.

22nd - F.M.


  March
1st & 31st - L.Q.
8th - N.M. 
15th - F.Q.
23rd - F.M.

  April
7th - N.M. 

13th - F.Q.
22nd - F.M.
29th - L.Q.

  May
6th - N.M. 
13th - F.Q.
21st - F.M.
29th - L.Q.

  June
4th - N.M. 
12th - F.Q.
20th - F.M.
27th - L.Q.

  July
4th - N.M.
11th - F.Q.
19th - F.M.

26th - L.Q.

  August
2nd - N.M.
10th - F.Q.
18th - F.M.
24th - L.Q.

  September
1st & 30th - N.M.
9th - F.Q.
16th - F.M.
23rd - L.Q.

  October
9th - F.Q.
16th - F.M.
22nd - L.Q.
30th - N.M.

  November
7th - F.Q.
14th - F.M.
21st - L.Q.
29th - N.M.

  December
7th - F.Q.
13th - F.M.
20th - L.Q.
29th - N.M.

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​​Dean Memorial Observatory is located on the grounds of Marshall County's Green Castle Recreation Area. The observatory is surrounded on 3 sides by the Green Castle Recreation Area's Bison enclosure. Watch for the Observatory and Bison Enclosure signs at the junction in the road inside the recreation area. Go straight ahead at the signs, follow the road as it meanders past the Trumpeter Swan enclosure, and then go up the hill to the observatory parking area.

Dean Memorial Observatory is maintained and operated by the Amateur Astronomers of Central Iowa.

*  On the Bortle scale of light pollution interference the observatory site is a Bortle 4, Rural/Suburban transition site with a naked-eye limiting magnitude (NELM) of 6.1–6.5.For reference, City sky is typically Bortle 8 with a naked-eye limiting magnitude of 4.1–4.5.

AACI is a non-profit astronomy club in central Iowa for people that share an interest in astronomy, space, nature, and science. AACI strives to promote interest in astronomy, and to share opportunities for viewing the night sky.


You don't need to have a telescope, or even much knowledge of astronomy to be an AACI member.

In fact, the main reason for the club is to pool and share our knowledge among club members and with the public. Many AACI members are families and children of all ages are very welcome.


Starting Friday April 15, 2016 the club will have public observing at Dean Memorial Observatory every Friday night  the weather permits doing so. In previous years the club only had public observing nights once a month.


AACI  monthly meetings are open to the public and are an excellent way to find out more about the club and to meet some club members. During the cold, snowy winter months the monthly meeting is held indoors at the Fisher Community Center in Marshalltown, Iowa


Monthly meetings start with a 30 to 40 minute astronomy themed presentation. Club business is then conducted after the presentation. Star-gazing begins once the club meeting ends (except in the winter).

 Amateur Astronomers

       of Central Iowa