Rahu in the 1st house of a Capricorn ascendant (Makar Lagna) in a birth chart can bring several effects:

1. Ambition and Drive: Rahu in the 1st house can amplify ambition, drive, and a desire for success. It may enhance leadership qualities and a strong urge to achieve goals.
2. Unconventional Approach: This placement may incline individuals toward non-traditional or unconventional paths in life. It can bring a quest for uniqueness or a desire to stand out from the crowd.
3. Challenges with Identity: Rahu’s presence might create challenges in establishing a clear sense of identity or authenticity. There could be a tendency towards self-doubt or confusion about one’s true self.
4. Struggles and Transformation: Individuals might face ups and downs, encountering challenges that lead to personal growth and transformation. Rahu’s influence can bring sudden changes or unexpected events.
5. Desire for Recognition: There could be a strong desire for recognition, fame, or social status. However, this desire might lead to internal conflicts or feelings of dissatisfaction if not achieved.
6. Impact on Relationships: Rahu in the 1st house might affect relationships, causing a need for independence or unconventional dynamics in partnerships.
7. Eccentricity and Innovation: It can encourage innovative thinking, creativity, and eccentricity. Individuals might possess unique perspectives and ideas.

The effects of Rahu in the 1st house for a Capricorn ascendant can significantly vary based on other planetary placements, aspects, and the overall configuration of the birth chart. Consulting with a knowledgeable astrologer can provide a more comprehensive understanding of its influences and guidance on navigating its energies.