... Space flight . ... The L-39 two-seat training jet plane is intended for flights in regular and complex meteorological conditions at day and night time, as well as for acrobatic flying. ... A cockpit canopy is pressure-tight with a single layer glazing, the back-folding parts can be thrown off under abnormal condition by pyrotechnical systems. ... Comparable on size and assigned tasks with the American F-16 and F/A-18 fighters, the MIG - 29 is presently in the service of 23 countries of the world. ...

... All portable ladders will meet ANSI standards. The use of step or platform ladders longer than 12 feet, extension ladders longer than 17 feet working length, or straight ladders longer than 20 feet is discouraged. ... Users are responsible for inspecting every ladder they use prior to each use. ... Ladders used to access a walking surface or roof must extend at least 36 inches above the landing. ... Users must face the ladder when ascending or descending, taking one step at a time. ...

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... Telescopes . ... Fig. ... Theoretical optical resolving power of the MSS, depending on the phases of the moon under typical weather conditions. ... The optical resolving power of the telescope with the MSS allows to observe stars of up to the 12 magnitude. ... Currently, more than 90% of observational time with the MSS spectrograph is used in the spectropolarimeter mode with a diffraction grating 24.7њ. ... wide spectral region with a reciprocal linear dispersion of 9 ?/mm (0.1215 ?/pix) at a time. ...

... As modern observatories evolve to production units delivering data products and calibrated scientific data to the end users, new challenges arise in assessing the quality of data products. ... Taking the analogy of speed control on a motorway we can describe the system as a device (radar) collecting measurements of the system performance (passing cars). ... One of the direct applications of quality control is the verification of instrument performance based on the analysis of calibration exposures. ...

... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 . ... mod_rewrite provides a way to modify incoming URL requests, dynamically, based on regular expression rules. ... The URL manipulations can depend on various tests: server variables, environment variables, HTTP headers, time stamps, external database lookups, and various other external programs or handlers, can be used to achieve granular URL matching. ... mod_rewrite reference documentation . ...

Molecular Cloud Barnard 163 . ... In the center of the above image lies Barnard 163, a nebula of molecular gas and dust so thick that visible light can't shine through it. ... The red glow in the background results from IC 1396, a large emission nebula that houses the Elephant's Trunk Nebula . Finding Barnard 163 in an image of its greater emission nebula IC 1396 can be a challenge, but it's possible. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...

CCD Forum Message . Forums: . Atm ћ Astrophotography ћ Blackholes ћ Blackholes2 ћ CCD ћ Celestron ћ Domes ћ Education . ... Discussion Forums | CCD Tips and Techniques | Post . ... Tri-Color Images . Forum List | ... Post Message | ... Login to Post . ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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