have been terming
Present perfect progressive conjugation of term. There are other translations for this conjugation.

term

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This is neither a window reflection nor a direct capture of Planet X at sundown, which we have been terming Second Sun sightings.
Ésta no es, ni una reflexión de la ventana ni una toma directa del Planeta X, a la puesta del Sol, fenómeno que nosotros hemos estado denominando vistas de un Segundo Sol.
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