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Soobshenie |
V. E. Zharov/GAISh, Moskva
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Sfericheskaya astronomiya
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7.06.2003 20:42 |
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V poslednie dva desyatiletiya XX veka v razvitii
astrometrii nastupil novyi etap. V svyazi s
i ispol'zovaniem takih instrumentov,
kak radiointerferometry so sverhdlinnymi bazami,
dal'nomery dlya lazernoi lokacii Luny i sputnikov, kosmicheskie
navigacionnye sistemy GPS i GLONASS, tochnost' poluchaemyh astrometricheskih dannyh
povysilas'
na tri poryadka.
>> Prochitat' stat'yu
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| Naverh |
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Gost'
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Re: Sfericheskaya astronomiya
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9.12.2005 18:41 |
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Orty sfericheskoi sistemy koordinat vyrazhayutsya cherez orty dekartovoi sleduyushim obrazom: ir = (cos(lambda)*ix+
sin(lambda)*iy)sin(theta) + cos(theta)*iz, ilambda = -sin(lambda)*ix+
cos(lambda)*iy, itheta = (cos(lambda)*ix+ sin(lambda)*iy)cos(theta)-
sin(theta)*iz, otkuda, pri theta=90o i lambda=0o sleduet, chto ir = ix, ilambda
= iy, itheta = -iz. Eto oznachaet, chto troiki ortonormirovannogo bazisa dekartovoi
i sfericheskoi sistem koordinat - protivopolozhno orientirovany (znak "-" pered ortom iz). Esliu dekartovoi sistemypravaya orientaciya
bazisnoi troiki, to u sistemy sfericheskoi v dannom sluchae ona - LEVAYa. Avtoram stat'i neobhodimo razobrat'sya s putanicei, vytekayushei iz togo, chto oni pishut.
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| Naverh |
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Gost'
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Re: Sfericheskaya astronomiya
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1.03.2006 3:00 |
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Ochen' ponravilos' to, chto takoi sait vse-taki est'. No ya nikak ne mogu naiti analogii Nepera, v chastnosti, "Koleso (okruzhnost', krug) Nepera". Izvinyayus' za netochnost'
termina, perevodil s angliiskogo. Eto ispol'zuetsya pri vychislenii verteksa (perpendikulyar iz polyusa) k DBK (Duga Bol'shogo Kruga). Gde eto mozhno naiti? S uvazheniem, Evgenii.
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| Naverh |
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E. V. Kazakov
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Re[2]: Sfericheskaya astronomiya
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3.03.2006 12:19 |
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Eto prosto mnem
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| Naverh |
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E. V. Kazakov
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Re[3]: Sfericheskaya astronomiya
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3.03.2006 12:20 |
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Eto prosto mnemonicheskoe pravilo dlya zapominaniya formul sfericheskoi trigonometrii. Sm., naprimer, zdes':
http://www.cultinfo.ru/fulltext/1/001/008/107/980.htm
i
li h
t
tp://www.krugosvet.ru/articles/119/1011993/print.htm
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| Naverh |
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A. e. Rus
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Re: Sfericheskaya astronomiya
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2.12.2006 11:09 |
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K sozhaleniyu, ya tak i ne ponyal prakticheskoi rekomendacii, kak, znaya astronomicheskie koordinaty observatorii, a takzhe GPS polozhenie, ya mogu s maksimal'noi tochnost'yu opredelit'
(1)- rasstoyanie do centra Zemli, i chto dlya menya bolee vazhno - (2) proekciyu radius-vektora (ot centra Zemli do observatorii) na ploskost' Zemnogo ekvatora. Naprimer, esli 1)
an astronomical measurement (theodolite timing ) which refers to the Geoid
W 03 23 56.285 (error 0.058)
N 37 04 06.168 (0.440)
altitude 2851.5 m
2) a GPS position fererring to their ellipsoid WGS84
W 03 23 34.16091 (0.006)
N 37 03 57.97407 (0.007)
altitude 2903.995 m to chemu
ravny (1) i (2)? Zaranee spasibo za pomosh'.
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| Naverh |
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G. B. Vishnyackii
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Re: Sfericheskaya astronomiya
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29.02.2012 16:26 |
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Priyatno, chto uroven' dostatochno prilichnyi po sravneniyu s bol'shinstvom chepuhi, kotoraya napisana na etu temu v internete.
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| Naverh |
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G. B. Vishnyackii
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Re[2]: Sfericheskaya astronomiya
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3.03.2012 16:40 |
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Cho ... ? Nu i chto? Bednyaga!
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| Naverh |
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G. B. Vishnyackii
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Re[2]: Sfericheskaya astronomiya
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3.03.2012 16:44 |
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<
tbody>| Citata: |
Orty sfericheskoi sistemy koordinat vyrazhayutsya cherez orty dekart
ovoi sleduyushim obrazom: ir = (cos(la
mbda)*ix+ sin(lambda)*iy)sin(theta) + cos(the
ta)*iz, ilambda = -sin(lamb
da)*ix+
cos(lambda)*iy, itheta = (co
s(lambda)*ix+ sin(lambda)*iy)cos(theta)- s
in(theta)*iz, otkuda, pri theta=90o i l
ambda=0o sleduet, chto ir = <
strong>ix, ilambda = <
strong>iy, itheta = -iz. Eto oznachaet, chto troiki ortonormirovannogo bazisa dek
artovoi i sfe
richeskoi sistem koordinat - protivopolozhno orientirovany (znak "-" pered ortom iz). Esliu dekartovoi sistemypravaya orientaciya bazisno
i troiki, to u sistemy sfericheskoi v dannom sluchae ona - LEVAYa. Avtoram stat'i neobhod
imo razobrat'sya s putanicei, vytekayushei iz togo, chto oni pishut. Nu i chto? Bednya
ga.... |
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| Naverh |
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G. B. Vishnyackii
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Re: Sfericheskaya astronomiya
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5.03.2012 14:53 |
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Zamechanie po knige Zharova. Napisano: 2.3. Sfericheskaya sistema koordinat Dlya
resheniya mnogih zadach okazyvaetsya udobnee vmesto dekartovoi sistemy ispol'zovat' krivolineinye sistemy koordinat. V obshem sluchae ispol'zuyutsya tri funkcii  ,  ,  dlya opredeleniya polozheniya
tela v prostranstve. Koordinatnaya setka sostoit iz peresekayushihsya krivyh fi (x, y, z) = const ... Vmesto"peresekayushihsya krivyh" sleduet napisat' "peresekayushihsya koordinatnyh ploskostei".
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| Naverh |
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G. B. Vishnyackii
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Re: Sfericheskaya astronomiya
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5.03.2012 14:55 |
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Zamechanie po knige Zharova. Napisano: 2.3. Sfericheskaya sistema koordinat
Dlya resheniya mnogih zadach okazyvaetsya udobnee vmesto dekartovoi sistemy ispol'zovat' krivolineinye sistemy koordinat. V obshem sluchae ispol'zuyutsya tri funkcii
, , dlya opredeleniya polozheniya tela v prostranstve. Koordinatnaya setka
sostoit iz peresekayushihsya krivyh fi (x, y, z) = const ... Vmesto"peresekayushihsya krivyh"
sleduet napisat' "peresekayushihsya koordinatnyh poverhnostei".
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