Magha is the tenth, ruled by Ketu, its symbol a throne (also a palanquin), its deity the Pitṛs, the ancestors. The name means 'great, abundant'.
Mechanically Ketu releases backward and carries what came from before; the Pitṛs are the dead who went ahead of you — so this segment's power wasn't earned by you, it was handed down. The throne is an honest symbol: the seat is empty, many have sat in it, and its weight comes from those who did. So Magha is about lineage and position: family, blood, standing, and how heavily 'whose descendant am I' sits on you.
Where you'll recognise it: deep feeling for family and origin, care about dignity and appearances, being expected of and expecting of yourself, strong attitudes toward elders and tradition (close or resistant, but strong), and 'relax' as a difficult word. Running well, you carry the most weight: able to inherit, to represent, to give a group belonging and honour. Stuck, the throne crushes you — living inside others' expectations, a title standing in for a self, or throwing out the roots along with the tradition you were rejecting. Ashlesha before it sees into people; Purva Phalguni after it enjoys: having taken the seat, you have to learn to live well in it too.