Lunar/ Moon libration - An interesting Topic !

We all know we see one side of the moon due to its same rotation and revolution period. In general sense far side of the moon is not possible unless there is rover or satellite to take the photos.

Lunar libration at its longitude happens happens when Moon's rotation sometimes leads and sometimes lags its orbital position, it can reach to 7°54′ in amplitude.

 Lunar libration at its latitude happens because of slight inclination (about 6.7°) between the Moon's axis of rotation and the normal to the plane of its orbit around Earth.

 Diurnal libration is a small daily oscillation due to Earth's rotation, which carries an observer first to one side and then to the other side of the straight line joining Earth's and the Moon's centers, allowing the observer to look first around one side of the Moon and then around the other. 

Overall this give opportunity to see more surface of a moon at different times. So instead of 50 % we are able to see (over the time) 59% of Moon surface due to libration.

Note-Above information is based on wiki link below
https://en.wikipedia.org/wiki/Libration


Below is translation of above text in Portuguese by Elaine (Teacher from Brazil,In São Paulo)


Libração da Lua Lunar-
Um tema interessante!

Todos nós sabemos que vemos um lado da lua devido à sua mesma rotação e período de revolução.  Em geral, o outro lado da lua não é possível, a menos que haja um veículo espacial ou satélite para tirar as fotos.

A libração lunar em sua longitude acontece quando a rotação da Lua às vezes  atrasa sua posição orbital, podendo atingir 7 ° 54 ′ de amplitude.

A libração lunar em sua latitude ocorre devido à ligeira inclinação (cerca de 6,7 °) entre o eixo de rotação da Lua e a normal em relação ao plano de sua órbita ao redor da Terra.

A libração diurna é uma pequena oscilação diária devido à rotação da Terra, que carrega um observador primeiro para um lado e depois para o outro lado da linha reta que une os centros da Terra e da Lua, permitindo ao observador olhar primeiro em torno de um lado da Lua e  então em torno do outro.

No geral, isso dá oportunidade de ver mais superfície da lua em momentos diferentes.  Então, em vez de 50%, podemos ver (ao longo do tempo) 59% da superfície da Lua devido à libração.

 Observação: as informações acima são baseadas no link wiki abaixo; https://en.wikipedia.org/wiki/Libration

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