Heal

File Flashy poly omorfes oi fotografies sou! Keep on the good work!

O Hlias exei perasei to stadio tou stargazer kai isws exei xrono kai xrima gia spatali (gia poly kali mas tyxi pou apolamvanoume tis fotografies tou)

Akrivws,to prwto noumero einai to poses fores megenthynei afto pou paratireis. Qn prokeitai gia kyalia zoom tote einai gia paradeigma 7-25 (diladi deixnei ta antikeimena apo 7 ews 25 fores megalytera), an den exei dyo noumera alla mono ena tote den exoun zoom ta kyalia (afta einai protimotera gia tin astronomiki paratirisi). Meta to poses fores megenthynei yparxei ena X kai meta einai enas defteros arithmos. O defteros arithmos einai h diametros tou mprostinou fakou: megalyteros fakos= megalyteri epifaneia gia tin syllogi fwtos. Alla prosoxi giati ta megala kyalia einai varia kai kourastika stin paratirisi xwris tripoda. Kai epeidi exw parei grammi to skynews magazine simera edw einai ena arthro pou leei polla gia ta kyalia: http://www.skynewsmagazine.com/PDF/binoculars.pdf

Είναι πολύ ευχάριστο το γεγονός ότι πολλοί φίλοι ξεκινούν την ενασχόλησή τους με την Αστρονομία μέσα από τις σελίδες του Astrovox. Ο αρχικός όμως ενθουσιασμός μπορεί να οδηγήσει σε περιττά έξοδα, κόπο, λανθασμένες επιλογές και να αποθαρρυνθεί ο επίδοξος παρατηρητής του ουρανού, εγκαταλείντας το hobby. Στον παρακάτω σύνδεσμο υπάρχει ένα από τα πιο χρήσιμα άρθρα που έχω βρει. Δημοσιεύτικε στο τεύχος Νοεμβρίου- Δεκεμβρίου 2004 του Skynews από τον Alan Dyer. Πιστεύω πως οποιοσδήποτε θέλει να μπει στο παιχνίδι της παρατήρησης του ουρανού πρέπει να το διαβάσει! http://www.skynewsmagazine.com/PDF/10steps.pdf

Ενδιαφέρον άρθρο από το www.in.gr http://www.in.gr/news/article.asp?lngEntityID=646616&lngDtrID=252

Na sou pw tin alitheia, den to exw paratirisei egw, isws na exei na kanei me tin kinisi pou sou dinei afti tin entypwsi, giati o egkefalos antilamvanetai kalytera antikeimena pou kinountai para akinita. Twra gia to kokkino asteri pou les (afto to panw apo ton ymhto den me voithaei) einai eite o Aris eite o Aldebaran pou emfanizetai pio xamila.

Na kanoume mia paratirisi epeidi exoun ginei polla posts sto metaxy kai mporei na vgalei kapoios lathos symperasmata. To video den einai h xthesini paratirisi twn filwn pou egine aneksartita apo Athina kai Alexandroupoli alla apo palioteri paratirisi. Tetoia ATIA den einai spania kai se systimatikes paratiriseis, synithws einai poulia h kapoio aeroplano pou petaei psila. Otan omws dyo paratirites se megali apostasi vlepoun ena antikeimeno stin idia thesi ston ourano to opoio den mporoun na eksigisoun mporei eite na einai mia apistefti symptwsi giati tin opoia milise kai o Panagiwtis (quendi), mou fainetai omws apistefto na perase ena pouli ston ourano tis Alexandroupolis kai ena allo stin Athina mprosta sto feggari tin idia akrivws wra. Ara profanws itan kati sto diastima. Me vasi ta dedomena pou edwsan oi filoi kai meta apo syzitisi me ton Dr David Asher (eidiko se themata Near Earth Object) h pithanoteri ekdoxi einai na prokeitai gia asteroeidi diastasewn ligwn ekatontadwn metrwn (se kamia periptwsi panw apo 500 metra). Ypologizetai oti mono to 10% twn antikeimenwn tetoiwn diastasewn exoun paratirithei, par' oles tis erevnes pou ginontai pros afto ton tomea. Kata synepeia den einai apithani h parousia enos tetoiou antikeimenou se troxia konta stin Gh. Fysika afti h apopsi den tha mporesei pote na epalitheftei mias kai tha eprepe na ksanavroume ton asteroeidi. Anaferw afti tin apopsi me oles tis epifylakseis, ws tin pithanoteri ekdoxi.

Kai poly akrivo... Antwni/Niko ti akrivws einai to flat box? Kwstas

Dimitri exeis dikio, profanws to katalava lathos. An den isxyei kati tetoio mporoume efkola na thesoume ena katw fragma gia tin apostasi tou antikeimenou apo tin Gh. Gia na provalletai stin Selini h parallaksi den mporei na einai anw tou 1/2 tis moiras kai lamvanontas tin apostasi Athina Alexandroupoli sta 500 xiliometra se eytheia mas dinei oti h apostasi tou apo tin epifaneia tis Ghs einai toulaxtiston 50000 xiliometra. Oso gia tis diastaseis tou xreiazomaste mia ektimisi tis gwniwdous diastasis tou gia na milisoume me sigouria.

Den eipa tetoio pragma. Apla lew oti einai dyskolo ews apithano na einai h skia kapoiou antikeimenou makria apo tin Selini.

PS: O defteros paragontas pou prepei na lifthei ypopsin einai to poso grigora kinithike panw apo tin epifaneia tis Selinis kai pros poia katefthynsi. Gia paradeigma ta 14 defterolepta einai para polla gia na einai doryforos. An eimaste se thesi na gnwrizoume akrivws tote tha mporousame na vgaloume kapoio symperasma gia tin taxytita tou.

Na paroume ligo ta pragmata me ti seira. Kat' arxas h peristrofi: Gia na poume oti kati peristrefetai prepei na to deis na allazei sxima periodika. An exoume as poume mia sfaira pou peristrefetai den mporoume na to paritirisoume giati panta paramenei mia sfaira. Mia elleipsi omws tha allazei periodika sxima apo kati sfairoeides pros kati makrosteno. An eide o paratiritis kapoia tetoia allagi tote profanws peristrefotan. alliws omws den mporei kaneis na ypostriksei afti tin apopsi. As doume twra gia tin periptwsi tis skias antikeimenou panw stin epifaneia tis selinis: H skia enos antikeimenou gia na fanei stin Selini prepei profanws to antikeimeno na vrisketai panw sto efthygrammo tmima pou enwnei Hlio kai Selini. Gia na dimiourgei ena antikeimeno skia prepei apo enan paratiriti o opoios vrisketai stin epifaneia tis Selinis na fainetai se diametro toulaxiston isi me tin diametro tou iliou. Gia paradeigma ena antikeimeno se megethos kermatos gia na dwsei skia prepei na vrisketai se apostasi 3 peripou metrwn apo to mati tou paratiriti. Oso pio makria einai to antikeimeno apo tin epifaneia tis Selinis toso mikroteri tha einai h skia. Gia afto to logo h skia tis Selinis (h dimetros tis Selinis einai 3500 xiliometra) kata tin diarkeia twn ekleipsewn kalyptei mia perioxi platous merikwn dekadwn xiliometrwn. Ena antikeimeno diametrou 1 xiliometrou prepei na vrisketai se apostasi to poly 100 xiliometrwn apo tin epifaneia tis Selinis gia na dwsei skia. Profanws kanenas doryforos den tha mporouse na dwsei skia panw stin epifaneia tis Selinis. An eprokeito gia ton megalytero asteroeidi pou gnwrizoume (o megalyteros exei diastaseis 1000km kai yparxoun 16 me diastaseis panw apo 250 xiliometra) tha eprepe na vrisketai se apostasi 100.000 xiliometrwn apo ti Selini, gia (enan asteroeidi me diametro 250 xiliometra h apostasi afti peftei sta 25.000 xiliometra). H periptwsi tis skias mou fainetai arketa apithani. Telos as paroume tin periptwsi na exoume ena antikeimeno pou paremvaletai metaksy Ghs kai Selinis. Edw einai dyo paragontes pou prepei na lifthoun ypopsin. An oi dyo paratiriseis eixan ginei taftoxrona h me diafora elaxistwn defteroleptwn tote afto to antikeimeno den tha mporouse na exei parallaksi panw apo 1 moira, pragma pou mas prosdiorizei oti h apostasi apo tin epifaneia tis Ghs einai panw apo 50.000 (me mia ektimisi oti h apostasi Athina Alexandroupoli einai 500 xiliometra). Alla symfwna me ta legomena twn filwn oi dyo paratiriseis eginan me diafora 11 leptwn. Afto periplekei ta pragmata kai xreiazetai na kseroume me megali akriveia pote akrivws eginan oi paratiriseis gia na mporesoume na vgaloume kapoio asfales symperasma.

Nai to eida kai egw. To pio periergo apo ola omws einai oti se dyo fotografies tou Dimitri pou exei pros ta katw stin istoselida me diafora 14 leptwn, stin mia fainetai h stagona enw stin alli oxi. Mou fainetai para poly parakseno kai den mporw na dwsw kapoia eksigisi.