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Firefly Planisphere Deluxe [Misc. Supplies]

3.5 out of 5 stars  See all reviews (6 customer reviews)

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Product details

  • Misc. Supplies
  • Language: English
  • ISBN-10: 1552977862
  • ISBN-13: 978-1552977866
  • Product Dimensions: 38.4 x 37.8 x 1.5 cm
  • Average Customer Review: 3.5 out of 5 stars  See all reviews (6 customer reviews)
  • Amazon Bestsellers Rank: 2,967,981 in Books (See Top 100 in Books)

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Customer Reviews

Most Helpful Customer Reviews
13 of 13 people found the following review helpful
4.0 out of 5 stars Value added planisphere? 17 April 2004
A planisphere is the descendant of the Astrolabe and consists of two discs, one representing the daily motion of the sky and the second (usually the back plate) representing the annual motion. By setting the time of day to coincide with the date, you get a representation of the stars that will be visible at the latitude the planisphere is calibrated for.
Any bookshop (and Amazon) will sell you a basic 10 inch planisphere for just over a fiver and a miniaturised 5 inch diameter planisphere will fit in a rucksack. If you do a Web search, you can find DIY planispheres to print onto acetate. Why did I shell out twenty quid on this large (15 inches in diameter) and heavy version?
A variety of reasons: the star map is much clearer than average, there is an extra cursor with an anelemma printed on it which allows accurate positioning of the Sun, hence Sun rise and set times and twilight times to be estimated, Tirion has provided a small booklet with full instructions, and tables of planet positions up to 2006 (easily extended), the outside of the disc has a scale of Right Ascension and the cursor has a declination scale - very handy for positioning objects like comets and satellites to check their visibility times. There are three different horizons provided for 40, 50 and 60 degrees of North latitude. I'm fairly near the 50-degree horizon but inhabitants of Inverness will be able to interpolate easily enough.
I also expect to be able to use this device in teaching - it attracts attention and people want to know how to use it. The back of the planisphere has a plain star map that duplicates the map on the main face - personally I would have preferred a table of planet co-ordinates here to make the device independent of the booklet.
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3 of 3 people found the following review helpful
5.0 out of 5 stars The ultimate planisphere 17 May 2007
By MarkDJ
This planisphere being that bit bigger has room for more stars, every Messier object and loads of the NGC objects which makes it perfect for deep sky observing. There are more reviews of this product on the Amazon.com website.

On one side you have an ultra detailed planisphere in colour which gives star colour and properties eg. double star, red dwarfs etc., also has a representation of the milky way and a very accurate RA and DEC for asteroid and comet searching.

On the other side you have a complete black and white star chart, shown in great detail and perfect for using a red light in the dark.

The only thing better is a laminated sky atlas 2000.

Indespensible.
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9 of 10 people found the following review helpful
2.0 out of 5 stars One for the daytime 26 Feb 2006
I chose this planisphere over the cheaper but more widely used Phillips one since I felt the larger size would make it clearer. It is very detailed and perfectly well designed until one gets out under a night sky. It simply cannot be read in the dark with a red light. The colours are low contrast pastels and the writing small and faint. To make it out I have to use a white light which then ruins night vision meaning I can see fewer of the stars I am supposed to be looking at.
If you want a detailed planisphere which you can look at to plan your observing session before you go out this is a good buy. However if you want something to use out in the field look elsewhere.
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