Ideas:

1. Why are the legs cut off? The same question should be asked for of all the corresponding persons in the rest of the week. Sun and Moon are shown in full figure, but not the real planets. Is this a sign implying lesser importance? I don't think that is the answer. Instead I think we should try to read this sign exactly as it looks: The feet are hidden from view and we cannot see the lower parts of the legs.

2. The planets are moving in the ecliptic plane and depending on time and place they are not always above the horizon. Of course this is true also for sun and moon, but that is obvious. Not so obvious are facts like that the sun is not visible above the polar circle during the winter and that the moon has an orbit which makes her travel sometimes high in the sky and sometimes low. Not being an astronomer I anyhow believe that in the winter above the polar circle there is no guarantee that the moon is visible. Easter Island lies ca 27^o south of the equator. I imagine that when the sun looks low in the sky (in winter) the planets are also low in the sky. But not so low as to be out of view because of that.

3. The orbit of a planet sometimes moves it to the other side of the sun (as seen from the earth) and then the planet seems small and insignificant, maybe even hidden by the sun. I guess this is what the sign means. I have already told about it trying to explain Mars in the week of Large Santiago. And even the elbow adornment of the Mars person above could be a sign for this phenomenon (more evident for this planet than for the others); the right part of the adornment seems to be partly hidden. And pehaps the lower parts of the elbow adornment, like the legs, are invisible?