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A penumbral lunar eclipse took place on Tuesday, January 20, 1981, the first of two lunar eclipses in 1981. In a rare total penumbral eclipse, the entire Moon was partially shaded by the Earth (though none of it was in complete shadow), and the shading across the Moon should have been quite visible at maximum eclipse. The penumbral phase lasted for 4 hours and 24 minutes in all, though for most of it, the eclipse was extremely difficult or impossible to see. The moon's apparent diameter was larger because the eclipse occurred 5.2 days after perigee (Perigee on approximately 1981 Jan 15 at 03:01:56.7 UTC).

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  • A penumbral lunar eclipse took place on Tuesday, January 20, 1981, the first of two lunar eclipses in 1981. In a rare total penumbral eclipse, the entire Moon was partially shaded by the Earth (though none of it was in complete shadow), and the shading across the Moon should have been quite visible at maximum eclipse. The penumbral phase lasted for 4 hours and 24 minutes in all, though for most of it, the eclipse was extremely difficult or impossible to see. The moon's apparent diameter was larger because the eclipse occurred 5.2 days after perigee (Perigee on approximately 1981 Jan 15 at 03:01:56.7 UTC). This was a relatively rare total penumbral lunar eclipse with the moon passing entirely within the penumbral shadow without entering the darker umbral shadow. (en)
  • O eclipse lunar de 20 de janeiro de 1981 foi um eclipse penumbral, o primeiro de dois eclipses lunares do ano, e único como penumbral. Teve magnitude penumbral de 1,0136 e umbral de -0,0192. Teve duração total de quase 264 minutos. Durante o instante máximo do eclipse, a faixa de penumbra da Terra conseguiu cobrir totalmente o disco lunar, fazendo com que seu brilho diminuísse gradualmente, e sua extremidade norte fosse um pouco mais escurecida, por estar mais próximo da sombra umbral terrestre. Foi um dos eclipses penumbrais mais escuros, apesar de ser difícil de perceber mudanças visíveis em um eclipse penumbral, geralmente. Neste caso, como a Lua entrou inteiramente na penumbra, ocorreu um eclipse do subtipo , o que é relativamente raro nos eclipses penumbrais. Nessas ocasiões, a perda de brilho e o leve escurecimento na superfície lunar fica um pouco mais acentuado. A última vez que ocorreu um eclipse desse tipo foi em , e a próxima vez será em 3 de março de 1988, quando deverá ser o maior e mais escuro eclipse penumbral do século XX. A Lua cruzou a região sul da penumbra da Terra, em nodo ascendente, dentro da constelação de Câncer, próxima às estrelas , Pollux e Castor, na constelação vizinha de Gêmeos. (pt)
  • 1981年1月20日月食为一次在协调世界时1981年1月20日出現的半影月食。該次月食半影食分為1.039、全影食分為-0.014。 (zh)
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  • 0.976200 (xsd:double)
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  • 1981-01-20 (xsd:date)
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  • -1.014100 (xsd:double)
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  • July 1981 (en)
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  • August 1980 (en)
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  • penumbral (en)
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  • 1981年1月20日月食为一次在协调世界时1981年1月20日出現的半影月食。該次月食半影食分為1.039、全影食分為-0.014。 (zh)
  • A penumbral lunar eclipse took place on Tuesday, January 20, 1981, the first of two lunar eclipses in 1981. In a rare total penumbral eclipse, the entire Moon was partially shaded by the Earth (though none of it was in complete shadow), and the shading across the Moon should have been quite visible at maximum eclipse. The penumbral phase lasted for 4 hours and 24 minutes in all, though for most of it, the eclipse was extremely difficult or impossible to see. The moon's apparent diameter was larger because the eclipse occurred 5.2 days after perigee (Perigee on approximately 1981 Jan 15 at 03:01:56.7 UTC). (en)
  • O eclipse lunar de 20 de janeiro de 1981 foi um eclipse penumbral, o primeiro de dois eclipses lunares do ano, e único como penumbral. Teve magnitude penumbral de 1,0136 e umbral de -0,0192. Teve duração total de quase 264 minutos. A Lua cruzou a região sul da penumbra da Terra, em nodo ascendente, dentro da constelação de Câncer, próxima às estrelas , Pollux e Castor, na constelação vizinha de Gêmeos. (pt)
rdfs:label
  • January 1981 lunar eclipse (en)
  • Eclipse lunar de 20 de janeiro de 1981 (pt)
  • 1981年1月20日月食 (zh)
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