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Six naked-eye planets

 posted: 19 days ago, on Wednesday, 2016 Jan 20 at 06:45
 tags: astronomy, outreach, almanack, Mercury, Venus, Mars, Jupiter, Saturn.

In the last week of January and into the first week of February, all six naked-eye planets - Mercury, Venus, Mars, Jupiter, Saturn, and the Earth - will be visible at the same time.

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Cederberg Observatory January visit

 posted: 28 days ago, on Monday, 2016 Jan 11 at 01:48
 tags: astronomy, outreach, Cederberg Observatory, Martin Lyons.

A quick visit to the Cederberg Observatory - after some 20 years - with Martin this week-end.

(photo: Early arrivals for the evening's stargazing. Photo by Martin Lyons.)

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Best 2016 astronomy events

 posted: 42 days ago, on Monday, 2015 Dec 28 at 06:24
 tags: astronomy, outreach, almanack.

Highlights on the southern-hemisphere stargazing and observing calendar.

(photo: Best events for the year (southern hemisphere view))

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Happy holidays!

 posted: 48 days ago, on Tuesday, 2015 Dec 22 at 04:59
 tags: Auke Slotegraaf.

With all my best wishes.

(photo: Best wishes and happy holidays!)

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Blaauwklippen Xmas Market astronomy outreach (2015 Dec 17-19)

 posted: 50 days ago, on Sunday, 2015 Dec 20 at 04:31
 tags: astronomy, outreach, StarPeople, Sun, Moon, events, Stellenbosch.

Pics from a three-day astronomy outreach gig at Blaauwklippen Xmas Market, Stellenbosch, by StarPeople & StarFriends.

(photo: Sunspot, 2015 December 17-19)

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Spring 2015 Southern Star Party

 posted: 90 days ago, on Tuesday, 2015 Nov 10 at 02:25
 tags: astronomy, SQM, star party, astrophotography, Southern Star Party.

A few pics from the Spring SSP.

(photo: Visitor/s from afar)

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Southern sky Astronomy Wall Calendar 2016

 posted: 116 days ago, on Thursday, 2015 Oct 15 at 03:51
 tags: astronomy, Southern Sky News.

The pre-order offer has expired, and only a handful of Calendars are now available, at R200 + packaging & posting.

(photo: Pre-order has expired.)

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Total lunar eclipse, Monday Sep 28

 posted: 133 days ago, on Monday, 2015 Sep 28 at 10:03
 tags: astronomy, astrophotography, Sun, Moon, Earth, lunar eclipse, atmospheric phenomena, Walter, events, Gordons Bay.

A collection of pics of the beautiful total eclipse of the Moon - thanks to Ed, Wendy, Paul, Leslie, Maciej and Christine!

(photo: Moon setting over the Bay, imaged at 06:05 SAST (EOS 60D, 50-mm f/3.5, ISO 640 1/3-sec))

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InOMN 2015

 posted: 147 days ago, on Monday, 2015 Sep 14 at 23:23
 tags: astronomy, outreach, InOMN, Moon, Star People, events, Ed Foster, Richard Ford, Gordons Bay.

Enthusiastic people, a beautiful setting with a lovely Moon, but alas, the wind!

(photo: International Observe the Moon Night (InOMN 2015) in Gordon's Bay, South Africa)

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Partial solar eclipse, Sunday Sep 13

 posted: 147 days ago, on Monday, 2015 Sep 14 at 07:30
 tags: astronomy, outreach, almanack, Sun, Moon, solar eclipse, lunar eclipse.

Some pics from this morning's partial solar eclipse.

(photo: Cloudy view of the partial solar eclipse.)

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Two eclipses this September!

 posted: 161 days ago, on Monday, 2015 Aug 31 at 01:52
 tags: astronomy, outreach, almanack, Sun, Moon, solar eclipse, lunar eclipse.

A partial eclipse of the Sun (Sunday, Sep 13) and a total eclipse of the Moon (Monday, Sep 28) grace our skies in September.

Update: solar eclipse photos.

(photo: The Sun as seen from four ZA places: Bloemfontein, Cape Town, Durban and Johannesburg)

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National Science Week 2015 at Iziko Planetarium

 posted: 189 days ago, on Monday, 2015 Aug 03 at 00:16
 tags: astronomy, outreach, light pollution, Sun, NSW 2015, Iziko, SAAO, SKA, SAASTA, Cape Town, photo diary, StarPeople.

Photo account of our National Science Week 2015 event at Iziko Museum's Planetarium, Cape Town.

(photo: Things to see and do during National Science Week 2015 in Cape Town, presented by StarPeople)

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Working with constellations in DOCdb

 posted: 330 days ago, on Sunday, 2015 Mar 15 at 10:00
 tags: astronomy, deep sky, docdb.net.

DOCdb now has constellations as a special type of "object", making planning your observing session even easier. This step-by-step guide shows how easy it is to use.

(photo: How to log in)

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DSLR Photometry Experiments. Visualizing what stacking does

 posted: 337 days ago, on Sunday, 2015 Mar 08 at 03:44
 tags: astronomy, astrophotography, DSLR photometry, Canon.

The reduction in noise following stacking of DSLR images of stars is illustrated.

(photo: HD 121228, cropped from a single frame (left) and from a stack of 17 frames (right).)

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DSLR Photometry Experiments. A dark curiosity

 posted: 337 days ago, on Sunday, 2015 Mar 08 at 02:34
 tags: astronomy, astrophotography, Canon, DSLR photometry.

A puzzling (and worrying) feature of dark frames, taken with a Canon EOS 60D, is presented. The author is desperate for a solution!

(photo: Figure 1. File size of a sequential series of 40 dark frames taken with a Canon EOS 60D (ISO 1600, 9-s exposure time, CR2 raw format).)

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DSLR Photometry Experiments. 4. How many darks?

 posted: 338 days ago, on Saturday, 2015 Mar 07 at 23:58
 tags: astronomy, astrophotography, DSLR photometry, Canon.

The effect of the number of dark frames subtracted from a light frame on the signal-to-noise ratio (SNR) of stars is investigated. The conclusion is that applying a single dark frame gives a substantial improvement in the SNR of stars, while applying additional dark frames gives only a very small improvement.

(photo: Five stars selected for S/R measurement.)

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Highlights on the southern-hemisphere stargazing and observing calendar.

cool stargazing events

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