by Nitpicker » Tue Aug 16, 2016 10:58 pm
Coil_Smoke wrote:Coil_Smoke wrote:Is this image looking East ( Sunrise ) or looking West (Sunset) ? I'm trying to figure out which direction is 'Solar System North' or 'Above' the ecliptic is this fine photo ...
Answering my own question and positing another ... I had a look at Stellarium And figure this image is a sunset looking West. It is remarkable how vertical the ecliptic appears from "Down Under" . it sure looks different from Mid Atlantic coast USA. Funny thing is, Mars looks 'South' of the ecliptic compared to the other visible planets. Is that even possible?
Mars is indeed a little south of the ecliptic at the moment. The ecliptic plane is defined by the Sun-Earth system. It is only an approximation of the orbital plane of the other planets.
Half the ecliptic is in the northern sky and half in the southern. The closer you are to the Earth's equator, the more vertical the ecliptic can appear relative to the horizon (at the right time of day/year). It can't be perfectly vertical unless you are in the tropics.
Being winter down here, the Sun is low in the sky in the short days, and the planets are high in the sky in the long nights. The same thing happens in the northern winter. Winter is typically better for observing the planets, weather notwithstanding.
In this APOD, taken from well south of the tropics, the ecliptic appears more vertical than it is, because of the projection.
[quote="Coil_Smoke"][quote="Coil_Smoke"]Is this image looking East ( Sunrise ) or looking West (Sunset) ? I'm trying to figure out which direction is 'Solar System North' or 'Above' the ecliptic is this fine photo ...[/quote]Answering my own question and positing another ... I had a look at Stellarium And figure this image is a sunset looking West. It is remarkable how vertical the ecliptic appears from "Down Under" . it sure looks different from Mid Atlantic coast USA. Funny thing is, Mars looks 'South' of the ecliptic compared to the other visible planets. Is that even possible? :?:[/quote]
Mars is indeed a little south of the ecliptic at the moment. The ecliptic plane is defined by the Sun-Earth system. It is only an approximation of the orbital plane of the other planets.
Half the ecliptic is in the northern sky and half in the southern. The closer you are to the Earth's equator, the more vertical the ecliptic can appear relative to the horizon (at the right time of day/year). It can't be perfectly vertical unless you are in the tropics.
Being winter down here, the Sun is low in the sky in the short days, and the planets are high in the sky in the long nights. The same thing happens in the northern winter. Winter is typically better for observing the planets, weather notwithstanding.
In this APOD, taken from well south of the tropics, the ecliptic appears more vertical than it is, because of the projection.