Hi, this is a photo from Hungary (Fényi Gyula Observatory, Miskolc), between the third and fourth contact of the Venus transit.
MEADE APO EMC 152/1370 with Baader solar filter + CANON EOS 1000D 1/1250 exposure time with ISO200.
It was quite cloudy, but finally we managed to see the end of the...
"When it does turn our way in the days ahead, it should be an "easy target for backyard solar telescopes," according to SpaceWeather.com."
Some of my friends told me it is also visible with the naked eye (using protection of course).
Hi,
I recommend the hirek.csillagaszat.hu website, as a trustworthy source of astronomy news in Hungarian. (non-profit, and the news are edited and reviewed by professional and amateur astronomers together.)...
Have you heard about that? A huge meteor (bolida) hit the atmosphere in 28th February somewhere in Hungary or Slovakia, at the border. It is possible that some remnants hit the ground as well. A lot of people heard ans saw the blast, there are seismology data as well. These are now under...
Dear Forumers,
As a non-English speaker, I am confused about absorbance and absorptance. I found some definitions on the Internet, but I am not sure if understand them well. Oxford dictionary says the following (Oxford Dictionary of Physics, 4th ED. ISBN0-19-860759-8) for abroptance: "Symbol...
Many thanks, Bob, I need to know if a simple so-called T2 adapter solves the problem or not. Hopefully yes, today I going to have a look at the telescope.
Clear Skies, TtM
Hi all,
Does anybody knows how to attach a CANON EOS 1000D onto a MEADE APO 152/1370 telescope? The telescope has a 2'' focuser drawtube. Many thanks, TtM
If all the heat from the metal can only pass into the water:
1. c_metal *_m_metal *delta_T_metal = c_water * m_water * delta_T_water
2. delta_T_water = T_final_water - T_initial_water and so on in the case of the metal
From this I think it is possible to answer the 4. question...
attempt
I can look out the saturation(vapor) pressure from a table. What do you mean about equ. temperature?
Here's my attempt to answer the questions:
Known quantities:
V_vessel - volume of the vessel
M_refr - molar mass of the gas
m_refr - mass of the refrigerant filled in the vessel...
I am afraid I was not clear. Just think about a vessel that contains some kind of a refrigerant, or LN2. Above it there is some vapor and air. The vessel is closed. The temperature is above the boiling point of the system.
-What is the pressure inside?
-How many gas molecules are in the vapor...
Hi dear Forumers,
I 've run into a little thermodynamic problem:
There is a closed vessel, containing a given amount of liquid. I heat up the vessel, higher than the boiling point of the liquid. Here it is what happens:
As a start, I know that the pressure inside the vessel consists of...
Dear Mr. McNamara,
Thank you for the comments! Basically my plan was to save my old files onto a DVD. After this I would like to delete them, but leaving the directory structure untouched. I have some symlinks that may cause problems. . . :rolleyes:
Kindest regards & merry christmas,
T...
Solution. . ?
After some "googling":
find /path/to/interest/ -type f -exec echo rm "{}" \;
.. and if you find everything allright, then just remove echo from the command line:
find /path/to/interest/ -type f -exec rm "{}" \;
Take care! rm can do a lot of harm!
Source is here...
Dear Forumers,
Simple problem: I have a nice directory structure on my PC (Linux). I would like to clean it, I mean to delete all the files within the directory structure, but I don't want to loose my directories.
Is there any simple solution for it? Some unix commands?
Thank you so much...