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Illusory loops vs actual loops. by Gerald Kelleher
The geocentric astronomers since the time of the Greeks observed that while the Sun appeared to travel through the background stars directly, all planets would...
(Multi-page thread 1 2 3)
Today 11:23 AM
by Gerald Kelleher Go to last post
21 54
It took NASA...four years to design a drone. by RichA[_6_]
http://www.bbc.com/news/world-us-canada-44090509
(Multi-page thread 1 2)
Today 07:03 AM
by Ninapenda Jibini Go to last post
17 59
North Korea to become magnet for amateur astronomers? by Chris.B[_3_]
With the previously closed country opening up to exploitation the dark skies could attract amateur...
(Multi-page thread 1 2)
May 18th 18 04:31 PM
by Chris.B[_3_] Go to last post
11 47
Kīlauea by Gerald Kelleher
This part of the Earth's geology brings it closest to that of Venus as the volcano itself is far from crustal boundaries where most of the evolutionary geology...
May 16th 18 07:21 AM
by Chris.B[_3_] Go to last post
2 29
Flat Earther and AGW Denier to head nasa into obscurity. by Chris.B[_3_]
Pavlov republicans vote for trumpet's nomination. Any plans to return to kindergarten for basic science lessons and management classes described as "fake...
(Multi-page thread 1 2 3 ... Last Page)
May 10th 18 12:33 PM
by Gary Harnagel Go to last post
355 551
Full moon at the South Pole by Gerald Kelleher
https://www.moongiant.com/phase/today/ https://www.usap.gov/videoclipsandmaps/spwebcam.cfm What a difference the diminishing light of the moon makes as...
May 10th 18 06:31 AM
by Gerald Kelleher Go to last post
7 45
First day of summer by Gerald Kelleher
The Celtic tradition broke the year into the light half which starts half way between Equinox and Solstice on May 1st (closest date) while the dark half began...
May 2nd 18 08:27 AM
by Gerald Kelleher Go to last post
1 65
Questar 5 specifications released: by RichA[_6_]
Interesting. An in-baffle tube field flattener. I'd probably have made it outboard and a f-stop reducer, but this still looks good. Figure maybe $5000 for the...
April 30th 18 12:51 AM
by Davoud[_1_] Go to last post
5 256
NASA is robbing the Russians blind by Quadibloc
A Verge article about delays in the publication of installments of _A Song of Ice and Fire_ says Russia charges $80 million per astronaut ferried to the...
April 29th 18 07:07 AM
by Chris.B[_3_] Go to last post
8 52
Actual time lapse vs distorted time lapse by Gerald Kelleher
The daily motion of the surface across the fully illuminated face on the September Equinox follows, at least from an orbital perspective, a Northwest to...
(Multi-page thread 1 2 3)
April 28th 18 09:34 AM
by Gerald Kelleher Go to last post
29 200
Averaging and the Equation of Time by Gerald Kelleher
Here take notice, that the Sun or the Earth passeth the 12. Signes, or makes an entire revolution in the Ecliptick in 365 days, 5 hours 49 min. or there...
April 23rd 18 09:12 PM
by Gerald Kelleher Go to last post
7 70
Hey, hook this up to a scope! by RichA[_6_]
https://www.dpreview.com/news/9846474491/you-can-own-the-world-s-first-single-shot-8-10-digital-camera-for-106-000
(Multi-page thread 1 2)
April 23rd 18 02:23 AM
by Davoud[_1_] Go to last post
18 90
We need new nomenclature by RichA[_6_]
I read a review of the ugly Baader Morpheus eyepieces on cloudynights and something stuck me. The reviewer used the term, "diffraction rings" (of a star)when...
April 17th 18 01:37 AM
by Razzmatazz Go to last post
2 73
NASA slips up! The TRUTH is finally revealed! by Quadibloc
Look at this image describing Exploration Mission-1: https://www.nasa.gov/image-feature/exploration-mission-1-map and the similar image about Exploration...
April 17th 18 12:29 AM
by Quadibloc Go to last post
7 81
Space Junk's R Us. by RichA[_6_]
http://money.cnn.com/2018/04/12/technology/vector-jim-cantrell-rocket-manufacturing/index.html
April 14th 18 07:47 AM
by Chris.B[_3_] Go to last post
1 81
Polar astronomy by Gerald Kelleher
Lots of innovations to consider during the period of polar twilight after the March Equinox at the South Pole station. The same principles apply to polar...
(Multi-page thread 1 2 3 ... Last Page)
April 9th 18 10:57 AM
by Quadibloc Go to last post
49 376
Radio Meteor Obs. Bull. March 2018 by Chris Steyaert
Radio Meteor Observation Bulletin No. 296 of March 2018 (58 K) is available now as http://www.rmob.org/rmobtext/rmob1803.txt More information and the visual...
April 5th 18 07:29 PM
by Chris Steyaert Go to last post
0 103
Proving the Earth's orbital motion. by Gerald Kelleher
The RA/Dec observers try their level best to equate circumpolar motion to daily rotation and that uses up the observation of the motion of the stars...
April 5th 18 04:38 PM
by Gerald Kelleher Go to last post
7 97
Tabby's Star Dimming Again by Quadibloc
Saw this news item: https://www.extremetech.com/extreme/266474-alien-megastructure-star-enters-another-dimming-phase John Savard
(Multi-page thread 1 2 3 ... Last Page)
April 5th 18 12:08 AM
by Jibini Kula Tumbili Kujisalimisha Go to last post
39 239
Lucky it wasn't the other way around by Quadibloc
Human activity actually improved the effectiveness of the van Allen belts as a barrier to space...
April 4th 18 07:02 AM
by Chris.B[_3_] Go to last post
2 104
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