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spec: If you're fortunate enough to live where the night sky is absolutely free of any stray light ( class 1 or 2 on the Bortle Scale - truly dark skies ) , you can see both of these galaxies with direct vision , but even if your sky is not perfectly dark ( class 4 on the Bortle Scale - rural / suburban transition ) , you may be able to see them with averted vision . Thickening in the artery ( atherosclerosis ) related to high blood pressure can be dramatic . We would not want to see people take this as a liberty to ditch healthy eating habits . Think of the marines storming the beaches at Iwo ; or taking the shell-torn ridges at Chosin , Guadalcanal ; patrolling the skies from Okinawa to Korea ; and now in Saudi Arabia . Moreover , PBGC receives no federal tax dollars . Faced with cloudy European skies , smoke-shrouded targets , enemy flak , and air defense fighters , America ’ s incoming bombers often were unable to see the ground or pick a target out of the clutter below . Following Isabelle rules , the process led to the creation of a fairly complex hierarchy of theories that , for the sake of comprehension , will be split in the next sections into separate sub-hierarchies , one presenting the theories that implement the Isabelle coding of DSL ( x ) and DDSTL ( x ) , the other presenting the theories that represent the Isabelle coding of Mobadtl requirements specification and reference model . " Just find a good location with a clear view to the west and look for Venus very low in the sky about 15 minutes after the sun has set . You seem to have a great affinity for playing in his films . Between ten novels , two short-story collections , three memoirs , and a half dozen books on subjects from cooking contests to West Africa to the invention of transportation alternatives , there 's something for everyone who enjoys quality writing . In the suburbs today , the night sky directly overhead is about 5 to 10 times brighter than the natural sky glow , and overhead in a large city , the sky may be 25 to 50 times brighter than the sky in a remote area unsullied by light pollution ! This class is oriented toward beginners ; nondrawers welcome . High pressure systems usually bring clear skies with occasional clouds ( seldom is there any precipitation ) . It also is possible that , in hazy conditions at night , the green laser beam might suddenly appear as a flashed row of vertical stripes in the sky . We sometimes call the first brainstorming meeting blue skying because we let no idea , no matter how grand or small , left unsaid . Removed from the glow of city lights and the din of city traffic , we found the nights serene , the skies deep black , the stars brilliant . When the sun is low on the horizon , its light must pass more air molecules to reach us than when it 's higher in the sky . `` I think fun intellectually , spiritually , socially . The god Khnemu is the only god in ancient Egypt that is shown ( and even at that , rarely ) , and applies in this case , with one hand pointed towards the sky , the other towards the earth . The commissioner also pointed out the strong growth made by eighth-grade students in mathematics . I also suspect most parents would put a lot of pressure on their kids to do something if they were not going to school , and that the ones most likely not to get that kind of parental pressure are the ones who are already not getting very much out of their educations . Healthy , well - maintained trees and shrubs increase the value of your property overall .