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Glossary term: Rotação

Description: Rotação é o movimento de um objeto em torno de uma linha imaginária, que é chamada de eixo de rotação. À medida que o objeto gira, cada uma de suas diferentes partes mantém exatamente a mesma distância do eixo de rotação. Em geral, as estrelas (inclusive o Sol), os planetas, as luas ou os asteroides giram em torno de um eixo fixo. A Terra gira em torno do eixo terrestre, que é a linha reta imaginária que passa pelos polos norte e sul da Terra. A rotação da Terra é responsável pela mudança na visão do céu noturno que todo observador que estiver na superfície da Terra verá, com novas estrelas surgindo continuamente no horizonte leste e se pondo no horizonte oeste. O fato de o Sol parecer se mover pelo céu durante o dia, nascendo no leste e se pondo no oeste, também é uma consequência da rotação da Terra.

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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The Big Dipper drifts lower towards the horizon on the left, on the right a comet rises in the sky.

Big Dipper and Comet Neowise C2020 F3

Caption: This time-lapse documents the trajectory of the iconic Big Dipper across three frames taken in July 2020. Captured from three locations in Italy, Tre Cime di Lavaredo Auronzo di Cadore, Monte Rite, Cibiana di Cadore, and Casera Razzo, Vigo di Cadore, this visual odyssey showcases the captivating journey of the Big Dipper with the addition of trails of stars painting a celestial canvas. It not only traces the path of this renowned asterism but also features the rare appearance of comet Neowise C/2020 F3, an extraordinary event that graced our skies during July 2020.
Credit: Giorgia Hofer/IAU OAE (CC BY 4.0)

License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons

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