Lagna phal: the same sky, read from your ascendant
The same sky read from your rising sign, which governs the body, the self and how a period is lived.
The lagna changes sign roughly every two hours, so you can only know yours if your birth time is right. That is the whole argument for settling it.
Every ascendant sign
Rashi phal and lagna phal are not the same reading
They use the same transits and count them from different places. Rashi phal counts houses from your moon sign and speaks to how a period is felt; lagna phal counts from your rising sign and speaks to the body, the circumstances and what a period asks of you. Classical practice reads both, which is exactly why this product keeps them at separate URLs: one page for Aries would have had to mean one of them and mislead everyone else.
You cannot know your lagna without a birth time
The ascendant is not a planet. It is the point of the zodiac rising over the eastern horizon, and the Earth turns it through a full sign roughly every two hours and a degree every four minutes. A birth time rounded to the nearest hour leaves your lagna a coin toss between two signs, and picking the wrong one here does not give you a slightly wrong reading, it gives you somebody else's.
The rising sign calculator returns yours from a time you trust. If you do not have one, rectification works it out from dated events in your life, and the birth time calculator shows how many different charts your current uncertainty still allows.