¿Cuándo llega la primavera?

Si bien el 21 de septiembre es el inicio de la “primavera calendario”, pero te recordamos que la “primavera meteorológica” ya se inició el pasado 1 de septiembre, mientras que la “primavera astronómica” llegará el 22 de septiembre de este año 2022.

Se establece por convención que las estaciones inician los días 21 (de marzo/junio/septiembre/diciembre), en el caso de la primavera para el hemisferio sur la fecha de inicio es el 21 de septiembre.

La primavera astronómica de este año 2022 comienza exactamente el 22 de septiembre a las 22.03 hora argentina, y tendrá una duración de 89 días, 20 horas y 44 minutos.

La precisión en el cálculo está relacionada con el momento preciso en el cual los rayos del Sol llegan de manera perpendicular a la línea imaginaria del Ecuador, ese instante es conocido como “equinoccio”, (del latín aequinoctium-aequus nocte-, “noche igual”). Cuando esto sucede la duración del día y la noche prácticamente coinciden (12 horas de duración). A pesar de que la palabra equinoccio nos remite a una igualdad, esto no es estrictamente así en todo el globo. Debido al tamaño del Sol respecto a su punto central y a la refracción atmosférica, hay diferencias en la duración del día en diferentes latitudes.

Esta situación entre el Sol y nuestro planeta, en la que se da la intersección entre el plano del ecuador celeste y la Eclíptica, ocurre dos veces al año. Por lo tanto hay dos equinoccios: uno en marzo (equinoccio de otoño/primavera para el hemisferio sur/norte), y el otro en septiembre (equinoccio de primavera/otoño para el hemisferio sur/norte), estos momentos varían año a año.

Además, en el viaje imaginario que realiza el Sol desde el hemisferio norte hacia el hemisferio sur y viceversa, existen también dos “solsticios” anuales (en junio y diciembre) indicando el inicio de las estaciones de invierno/verano en el hemisferio sur/norte respectivamente.

La fecha del equinoccio de septiembre fluctúa entre el 19 y el 24 de ese mes. Cada año cambia porque el año trópico, que es el tiempo entre dos pasos sucesivos del Sol por el equinoccio es de 365,2422 días solares medios, y ese número no es divisible con el año del calendario gregoriano de 365,2425 días solares medios. Este desfasaje hace que año a año la fecha y horario del equinoccio cambie. Por ejemplo, el próximo año 2023 el equinoccio de primavera para el hemisferio sur será el 23 de septiembre a las 3.50 hora argentina.

20 thoughts on “¿Cuándo llega la primavera?

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