<div dir="auto"><p style="margin:0px 0px 1em;padding:0px;border:0px;outline:0px;font-size:15.4px;vertical-align:baseline;background-color:rgb(255,255,246);line-height:1.25em;font-family:&#39;Cabin Condensed&#39;,arial,sans-serif;background-position:initial initial;background-repeat:initial initial">Este instante marca o início do Inverno no Hemisfério Norte, estação mais fria do ano. Neste dia, o sol no plano da eclíptica passará pela declinação mínima (latitude ao equador) de -23° 26′  4″, atingindo o máximo de fluxo de energia solar (J/m<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">2</sup>) no hemisfério sul do planeta.</p><p style="margin:0px 0px 1em;padding:0px;border:0px;outline:0px;font-size:15.4px;vertical-align:baseline;background-color:rgb(255,255,246);line-height:1.25em;font-family:&#39;Cabin Condensed&#39;,arial,sans-serif;background-position:initial initial;background-repeat:initial initial">Produz também um dos dias mais curtos do ano no hemisfério norte: apenas 9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 27<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min</sup> 4<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">s</sup> em Lisboa. O dia 21 é igualmente curto até à casa dos segundos. A duração do dia será de:  9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 8<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min</sup>em Bragança;  9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 12<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min </sup>no Porto;  9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 18<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min</sup> em Coimbra;  9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 21<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min </sup>em Castelo Branco;  9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 29<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min </sup>em Évora; 9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 33<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min </sup>em Ponta Delgada;  9<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 37<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min </sup>em Faro;  10<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> e 0<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min </sup>no Funchal;</p><p style="margin:0px 0px 1em;padding:0px;border:0px;outline:0px;font-size:15.4px;vertical-align:baseline;background-color:rgb(255,255,246);line-height:1.25em;font-family:&#39;Cabin Condensed&#39;,arial,sans-serif;background-position:initial initial;background-repeat:initial initial">Esta estação prolonga-se por 88,99 dias até ao próximo Equinócio que ocorre no dia 20 de Março de 2017 às 10<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">h</sup> 29<sup style="margin:0px;padding:0px;border:0px;outline:0px;font-size:0.7em;background-color:transparent;background-position:initial initial;background-repeat:initial initial">min</sup>.</p><p style="margin:0px 0px 1em;padding:0px;border:0px;outline:0px;font-size:15.4px;vertical-align:baseline;background-color:rgb(255,255,246);line-height:1.25em;font-family:&#39;Cabin Condensed&#39;,arial,sans-serif;background-position:initial initial;background-repeat:initial initial">Solstícios: pontos da eclíptica em que o Sol atinge as posições máxima e mínima de afastamento (altura) em relação ao equador, isto é, pontos em que a declinação do Sol atinge extremos: máxima no solstício de Verão e mínima no solstício de Inverno.</p><p style="margin:0px 0px 1em;padding:0px;border:0px;outline:0px;font-size:15.4px;vertical-align:baseline;background-color:rgb(255,255,246);line-height:1.25em;font-family:&#39;Cabin Condensed&#39;,arial,sans-serif;background-position:initial initial;background-repeat:initial initial">A palavra de origem latina (Solstitium) está associada à ideia de que o Sol devia estar estacionário, no movimento de afastamento ao equador, ao atingir a sua mais alta ou mais baixa posição no céu.</p><p style="margin:0px 0px 1em;padding:0px;border:0px;outline:0px;font-size:15.4px;vertical-align:baseline;background-color:rgb(255,255,246);line-height:1.25em;font-family:&#39;Cabin Condensed&#39;,arial,sans-serif;background-position:initial initial;background-repeat:initial initial">Fonte: Observatório Astronomico de Lisboa</p></div>